Article
Multidisciplinary Sciences
Emmanouil Frantzeskakis, Ji Dai, Cedric Bareille, Tobias C. Roedel, Monika Guettler, Sheng Ran, Noravee Kanchanavatee, Kevin Huang, Naveen Pouse, Christian T. Wolowiec, Emile D. L. Rienks, Pascal Lejay, Franck Fortuna, M. Brian Maple, Andres F. Santander-Syro
Summary: Spontaneous symmetry breaking leads to phase transitions characterized by an order parameter, with phase transitions involving unknown order parameters being rare but intriguing. The transition of the heavy fermion compound URu2Si2 into the hidden-order phase is still unsolved, with research showing the interaction between heavy fermions and conduction band states near the Fermi level playing a crucial role. Analysis using angle-resolved photoemission spectroscopy reveals that the nonrigid change in the electronic structure between the hidden-order and antiferromagnetic phases suggests a change in the interaction strength between states near the Fermi level is crucial for the phase transition.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Letter
Materials Science, Multidisciplinary
Xingyu Ji, Yun Zhang, Xiaoying Wang, Yi Liu
Summary: The study demonstrates power-law behavior in the electrical resistivity, magnetic susceptibility, and specific heat of high-quality URu2Si2 single crystals in the hidden-order region, consistent with the Griffiths model. The Griffiths phase is characterized by residual short-range correlations on the collapse of the long-range large-moment antiferromagnetic phase, with evidence of cluster-like spins.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Physics, Multidisciplinary
Edwin Herrera, Victor Barrena, Isabel Guillamon, Jose Augusto Galvis, William J. Herrera, Jose Castilla, Dai Aoki, Jacques Flouquet, Hermann Suderow
Summary: The researchers used scanning tunnelling microscopy to reveal a 1D charge density wave in URu2Si2, demonstrating a potential connection with the hidden order state and indicating that charge interactions are among the most relevant features competing with hidden order in URu2Si2.
COMMUNICATIONS PHYSICS
(2021)
Article
Multidisciplinary Sciences
Christian T. Wolowiec, Noravee Kanchanavatee, Kevin Huang, Sheng Ran, Alexander J. Breindel, Naveen Pouse, Kalyan Sasmal, Ryan E. Baumbach, Greta Chappell, Peter S. Riseborough, M. Brian Maple
Summary: Electrical resistivity measurements were performed on single crystals of URu2-xOsxSi(2) up to x = 0.28 under hydrostatic pressure up to 2 GPa, revealing that increasing Os concentration leads to lattice expansion, enhanced hidden-order (HO) phase, and a shift towards a large-moment antiferromagnetic (LMAFM) phase. Pressure, Fe substitution, and Os substitution are the only known perturbations that enhance the HO phase and induce the first-order transition to the LMAFM phase in URu2Si2.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Materials Science, Multidisciplinary
Shan Zhao, Bin Liu, Yi-feng Yang, Shiping Feng
Summary: Recent observations of two nodeless gaps in superconducting CeCu2Si2 have sparked intense debates over its exact gap structure, either sign-reversal (s+-) or sign-preserving (s++) pairing. In this study, we investigate the quasiparticle interference (QPI) using realistic Fermi surface topology and find qualitative distinctions between s+- and s++ pairing states, providing important insights into the true pairing symmetry in the material.
Article
Materials Science, Multidisciplinary
Naoki Shioda, Kazuki Kumeda, Hideto Fukazawa, Tetsuo Ohama, Yoh Kohori, Debarchan Das, Joanna Blawat, Dariusz Kaczorowski, Koudai Sugimoto
Summary: An analysis of heavy fermion superconductor Ce3PtIn11's nuclear quadrupole resonance spectra showed co-occurrence of two antiferromagnetic orderings followed by a superconducting transition, with Ce(2) site dominant in magnetic contribution and Ce(1) site having a small but not negligible magnetic moment.
Article
Physics, Multidisciplinary
Xingyu Wang, Dongliang Gong, Bo Liu, Xiaoyan Ma, Jinyu Zhao, Pengyu Wang, Yutao Sheng, Jing Guo, Liling Sun, Wen Zhang, Xinchun Lai, Shiyong Tan, Yi-feng Yang, Shiliang Li
Summary: The resistivity of URu2-xFexSi2 samples is influenced by uniaxial pressure, revealing qualitative differences between the hidden order and large-moment antiferromagnetic phases.
CHINESE PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sreekar Voleti, Koushik Pradhan, Subhro Bhattacharjee, Tanusri Saha-Dasgupta, Arun Paramekanti
Summary: In this study, the dual influence of impurity probes in cubic osmate double perovskites was explored. The impurities were found to induce local strain fields, suppressing the octupolar order while exposing the hidden order parameter. This work provides important implications for uncovering hidden order in diverse multipolar materials.
NPJ QUANTUM MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wen Zhang, Wei Feng, Xuebing Luo, Shiyong Tan, Donghua Xie, Yi Liu, Yun Zhang, Qunqing Hao, Qiang Zhang, Xiegang Zhu, Qin Liu, Qiuyun Chen, Xinchun Lai
Summary: Despite extensive research, the nature of the hidden order phase transition in the heavy fermion superconductor URu2Si2 remains ambiguous. This study used scanning tunneling microscopy/spectroscopy to investigate different terminations of the parent URu2Si2 and Fe-doped samples. It was found that the small gap previously attributed to the hidden order parameter appeared in both the hidden order and large moment antiferromagnetic phases on the U terminations, indicating it is not unique to the hidden order parameter. Additionally, a peak-gap-peak structure was observed on the Si terminations. The changes in spectral features with Fe concentration and temperature suggest alterations in f-c hybridization. The higher vanishing temperatures and larger sizes of the gap in the Fe-substituted samples indicate stronger f-c hybridization compared to URu2Si2. These findings demonstrate that hybridization is not the driving force for the hidden order phase transition.
Article
Physics, Particles & Fields
Zhong-Yu Wang, Zhi-Feng Sun
Summary: In this study, the hidden strange B-c-like molecular states in b (c) over bars (s) over bar systems were evaluated using the chiral unitary approach. The S-wave scattering amplitudes were calculated and six states below the threshold of the most relevant channel were identified. The binding energies of these states range from 1-10 MeV with widths around 0.2-0.7 MeV. This research provides a supplement to the mass spectra of Bc-like states and may be useful for future experimental searches.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Nuclear
Florian Seck, Tetyana Galatyuk, Ayon Mukherjee, Ralf Rapp, Jan Steinheimer, Joachim Stroth, Maximilian Wiest
Summary: In this study, researchers investigated the dilepton radiation from hot and dense fireballs created in Au-Au collisions at projectile energies of 1-2 AGeV for potential signatures of a first-order phase transition. They found that the latent heat involved in the first-order transition leads to a substantial increase in the low-mass thermal emission signal.
Article
Materials Science, Multidisciplinary
Peng Li, Huiqing Ye, Yong Hu, Yuan Fang, Zhiguang Xiao, Zhongzheng Wu, Zhaoyang Shan, Ravi P. Singh, Geetha Balakrishnan, Dawei Shen, Yi-feng Yang, Chao Cao, Nicholas C. Plumb, Michael Smidman, Ming Shi, Johann Kroha, Huiqiu Yuan, Frank Steglich, Yang Liu
Summary: In this study, direct spectroscopic evidence for the competition between magnetic order and the Kondo effect in a Kondo lattice system is found through high-resolution photoemission spectroscopy.
Article
Crystallography
Tianyi Han, Jiantao Che, Chenxiao Ye, Hai Huang
Summary: The kagome lattice, which consists of corner-sharing triangles, has been studied in quantum physics for over seventy years. The pairing symmetry of the order parameter for the newly discovered kagome superconductor CsV3Sb5 has remained a difficult problem to solve until now. Using the two-band Ginzburg-Landau theory, the temperature dependence of the upper critical field and magnetic penetration depth for this compound was investigated, and all theoretical results were consistent with experimental data, indicating the existence of two-gap s-wave superconductivity in this system. Additionally, the compound CsV3Sb5 exhibits a semi-heavy-fermion feature with an anisotropy of effective masses of about 70 or 2.4 in the band with a large or small gap, respectively.
Article
Materials Science, Multidisciplinary
P. Popcevic, I. Batistic, A. Smontara, K. Velebit, J. Jacimovic, I. Zivkovic, N. Tsyrulin, J. Piatek, H. Berger, A. Sidorenko, H. Ronnow, L. Forro, N. Barisic, E. Tutis
Summary: This study investigates the mechanisms of electric transport, magnetic ordering, and their interaction in Co1/3NbS2 compound. The results show that the compound exhibits a sensitive magnetic subsystem that can be completely suppressed under external pressure, and magnetic frustrations play an important role in this suppression. The study also reveals that the compound's transport properties respond differently to the presence of magnetic ordering or the application of hydrostatic pressure in different directions, and proposes a spin-valve mechanism involving intercalated Co ions as spin-selective electrical transport bridges.
Article
Physics, Condensed Matter
Wei-Ke Zou, Nuo-Wei Li, Fa-Li Chong
Summary: In this study, the charge and spin transports between a normal lead, an s-wave superconductor, and Majorana fermions at the ends of the nanowire are investigated using the Green's function method. The analytical expressions of charge conductance Gc and spin conductance Gsz at zero temperature are obtained in the limit of infinite superconducting gap Delta. The impacts of coupling constant x, Majorana fermions coupling energy epsilon(m), temperature kT, and superconducting gap Delta on Gc and Gsz are discussed. The results provide insights into the investigation and understanding of Majorana fermions in experiments.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jackson R. Badger, Yundi Quan, Matthew C. Staab, Shuntaro Sumita, Antonio Rossi, Kasey P. Devlin, Kelly Neubauer, Daniel S. Shulman, James C. Fettinger, Peter Klavins, Susan M. Kauzlarich, Dai Aoki, Inna M. Vishik, Warren E. Pickett, Valentin Taufour
Summary: Unconventional superconductors have Cooper pairs with lower symmetries compared to conventional superconductors. This article demonstrates that the time-reversal symmetry breaking in the superconductor LaNiGa2 is enabled by its previously unknown topological electronic band structure. These unique topological features allow LaNiGa2 to break time-reversal symmetry in the absence of other typical ingredients, providing a pathway for identifying a new type of unconventional superconductors based on nonsymmorphic symmetries.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Condensed Matter
Zihao Shen, X. D. Zhu, Rahim R. Ullah, Peter Klavins, Valentin Taufour
Summary: In this study, we present the results of bulk magnetization measurements and spatially resolved measurements of magnetic domains in Co3Sn2S2.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Multidisciplinary
M. Zhu, D. J. Voneshen, S. Raymond, O. J. Lipscombe, C. C. Tam, S. M. Hayden
Summary: In this study, we demonstrate through inelastic neutron scattering that there are low-energy collective spin fluctuations near the superconducting critical temperature and near the doping p* in cuprate superconductors. These spin fluctuations are attributed to the collapse of the pseudogap combined with an underlying tendency to magnetic order. They exist across the superconducting phase diagram and may be related to the strange metal behavior observed in overdoped cuprates.
Article
Materials Science, Multidisciplinary
Kazuaki Iwasa, Kazuya Suyama, Seiko Ohira-Kawamura, Kenji Nakajima, Stephane Raymond, Paul Steffens, Akira Yamada, Tatsuma D. Matsuda, Yuji Aoki, Ikuto Kawasaki, Shin-ichi Fujimori, Hiroshi Yamagami, Makoto Yokoyama
Summary: This study investigates the spin dynamics, crystalline-electric-field (CEF) level scheme, specific heat, and x-ray photoemission spectra (XPS) of Ce3Rh4Sn13, a material that exhibits anomalous semimetal transport in the chiral crystallographic phase. The observed CEF excitations of approximately 7 and 39 meV align with the two different Ce-ion sites in the chiral structure. The hybridized Ce 4f electrons contribute to the semimetal carriers due to broader CEF excitations and a strong 4f(1) peak at the Fermi level. Additionally, the spin fluctuation associated with the Kramers doublet ground state is characterized by a peak at 0.15 meV, and the electronic state involving this spin fluctuation causes the T-3 behavior of specific heat below 0.6 K, attributed to linear dispersion relations of electrons in the Weyl-Kondo semimetal in the chiral-lattice symmetry.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ashlee K. Hauble, Kamil Ciesielski, Valentin Taufour, Eric S. Toberer, Susan M. Kauzlarich
Summary: In this study, Ba2-xEuxZnSb2 was synthesized by substituting Eu for Ba to improve the stability of the material in air and to characterize its thermal and electronic properties. The samples exhibited low thermal conductivity (<0.8 W/m K), high Seebeck coefficient (350-550 mu V/K), and high charge carrier mobility (20-35 cm2/V) from 300 to 500 K, consistent with predictions of high thermoelectric efficiency. Evaluation of the thermoelectric quality factor suggests that a higher zT can be achieved by increasing the carrier concentration through doping.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Arvind Maurya, Hisatomo Harima, Fuminori Honda, Yusei Shimizu, Yoshiki J. Sato, Ai Nakamura, Dexin Li, Yoshiya Homma, Dai Aoki
Summary: In this study, we observed bulk superconductivity in LaNiZn below Tc = 1.5 K, as confirmed by its electrical transport and specific heat capacity (Delta Cel/gamma Tc = 1.41). The upper critical fields along the hexagonal crystallographic c-axis and in the basal plane at 30 mK were found to be 0.36 and 0.24 T, respectively, suggesting mainly an orbital mechanism for field-induced depairing and a negligible spin triplet component in the superconducting order parameter. The angular dependence of Hc2 is explained by an effective mass model with an oblate-shaped effective Fermi surface. Our experimental and band calculation under local density approximation results suggested that LaNiZn is a Bardeen- Cooper-Schrieffer s-wave-type superconductor in the dirty limit, possibly involving multiple bands.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Shiki Ogata, Shunsaku Kitagawa, Katsuki Kinjo, Kenji Ishida, Manuel Brando, Elena Hassinger, Christoph Geibel, Seunghyun Khim
Summary: CeRh2As2 is the first example of multiple superconducting phases due to the sublattice degrees of freedom. In this study, the spin susceptibility of CeRh2As2 at two crystallographically inequivalent As sites was measured using nuclear magnetic resonance. The results strongly indicate that both superconducting phases are spin-singlet states, and there is no sign of magnetic ordering in the high-field superconducting phase.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
A. Rosuel, C. Marcenat, G. Knebel, T. Klein, A. Pourret, N. Marquardt, Q. Niu, S. Rousseau, A. Demuer, G. Seyfarth, G. Lapertot, D. Aoki, D. Braithwaite, J. Flouquet, J. P. Brison
Summary: The recently discovered superconductor UTe2, with a superconducting transition temperature Tc between 1.5 and 2 K, has raised great attention due to its strong suspicion of spin-triplet and topological superconductivity. The properties of UTe2 under a magnetic field are also remarkable, showing field-reinforced and field-induced superconducting phases. This study provides the first complete thermodynamic determination of the phase diagram for fields applied along different crystallographic directions, revealing a strong negative curvature of the upper critical field along the easy axis and the existence of a phase transition line within the superconducting phase.
Article
Physics, Applied
Joshua F. Belot, Valentin Taufour, Stefano Sanvito, Gus L. W. Hart
Summary: Researchers developed machine-learning models based on the chemical composition of materials to predict Curie temperatures. A random-forest model provided the most accurate predictions and did not require dimensionality reduction or complex descriptors. Cobalt-rich and iron-rich materials showed the highest Curie temperatures among binary and ternary compounds.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
N. Biniskos, F. J. dos Santos, M. dos Santos Dias, S. Raymond, K. Schmalzl, P. Steffens, J. Persson, N. Marzari, S. Bluegel, S. Lounis, T. Brueckel
Summary: In this study, we investigate the spin-excitation spectrum of bulk Mn5Si3 using inelastic neutron scattering measurements and density functional theory calculations. We find that the spin dynamics of each phase in Mn5Si3 is robust against any combination of temperature and magnetic field. The high-energy spin dynamics exhibit distinctive characteristics of either spin waves or broad fluctuation patterns in different phases.
Article
Materials Science, Multidisciplinary
R. R. Ullah, P. Klavins, X. D. Zhu, V. Taufour
Summary: Two ferromagnetic phases, FM1 and FM2, were found to exist in LaCrGe3, and the domain structure undergoes a substantial change between these two phases. The measurements of the coercive field and magnetization curves reveal unconventional magnetic domain behavior in the FM1 phase, followed by a depinning region as the system transitions into the FM2 phase.
Article
Materials Science, Multidisciplinary
Arvind Maurya, Atsushi Miyake, Hisashi Kotegawa, Yusei Shimizu, Yoshiki J. Sato, Ai Nakamura, Dexin Li, Yoshiya Homma, Fuminori Honda, Masashi Tokunaga, Dai Aoki
Summary: We report the single-crystal growth of UNi4P2 and demonstrate its Ising-type ferromagnetism with a Curie temperature of 25 K through magnetization, electrical transport, and specific heat measurements. The strong anisotropy between the c axis and the tetragonal basal plane is maintained up to 57 T, while the intraplane anisotropy gradually disappears at higher fields. Our findings suggest that anisotropic electron correlations may stabilize Ising-type ferromagnetic order in one dimension at nonzero temperatures, potentially with its own characteristic universality class.
Article
Chemistry, Physical
Luke M. McClintock, Long Yuan, Ziyi Song, Michael T. Pettes, Dmitry Yarotski, Rijan Karkee, David A. Strubbe, Liang Z. Tan, Azza Ben-Akacha, Biwu Ma, Yunshu Shi, Valentin Taufour, Dong Yu
Summary: 1D organic metal halide hybrids (OMHHs) exhibit promising optical properties for photodetection and lighting applications, but the governing mechanisms and surface effects are not well understood. This study investigates the optical properties of 1D C4N2H14PbBr4 through polarization-dependent time-averaged and time-resolved photoluminescence spectroscopy. The results reveal an excitation-energy-dependent anisotropic emission, which is attributed to fast surface recombination confirmed by first-principles calculations and experimental measurements.
Article
Materials Science, Multidisciplinary
K. Kinjo, H. Fujibayashi, S. Kitagawa, K. Ishida, Y. Tokunaga, H. Sakai, S. Kambe, A. Nakamura, Y. Shimizu, Y. Homma, D. X. Li, F. Honda, D. Aoki, K. Hiraki, M. Kimata, T. Sasaki
Summary: UTe2 is a recently discovered spin-triplet superconductor with a magnetic field (H)-boosted superconductivity >16 T when H is applied exactly parallel to the b axis. The high-H superconducting (HHSC) phase of UTe2 has not been thoroughly investigated, and its SC properties as well as the spin state are not well understood. In this study, AC magnetic susceptibility and nuclear magnetic resonance measurements were performed, revealing that the HHSC state has bulk nature and is sensitive to the H angle, with different SC character compared to the low-H superconducting (LHSC) state. The dominant spin component of the spin-triplet pair also changes from the LHSC state (along the a axis) to the HHSC state (along the b axis). Our findings suggest that the H-induced multiple SC states originate from the remaining spin degrees of freedom.
Article
Materials Science, Multidisciplinary
V. Baledent, A. Vaunat, S. Petit, L. Nataf, S. Chattopadhyay, S. Raymond, P. Foury-Leylekian
Summary: This paper investigates the physical properties of the type-II multiferroic GdMn2O5 material using neutron scattering, electric polarization, and magnetization measurements. A complex (T,H) phase diagram is observed, with a field-induced magnetic transition occurring at around 11 T at low temperature. In the high-field phase, an additional electric polarization along both the a and b directions is observed, which is allowed by symmetry but has never been experimentally observed before. While the magnetic properties return to their initial states after the field is driven back to zero, the polarization along the a direction shows a significant increase. This behavior, observed for all directions of the magnetic field, represents a novel and striking manifestation of magnetoelectric coupling, resulting in the establishment of a new ground state at zero magnetic field.