Article
Physics, Multidisciplinary
Jake Ayres, Matija Culo, Jonathan Buhot, Bence Bernath, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi, Antony Carrington, Sven Friedemann, Nigel E. Hussey
Summary: In this study, the authors investigate the resistive properties of sulfur-doped FeSe under applied pressure and find evidence of a decoupling of electronic nematicity and magnetic fluctuations in this system.
COMMUNICATIONS PHYSICS
(2022)
Article
Multidisciplinary Sciences
Kousuke Ishida, Yugo Onishi, Masaya Tsujii, Kiyotaka Mukasa, Mingwei Qiu, Mikihiko Saito, Yuichi Sugimura, Kohei Matsuura, Yuta Mizukami, Kenichiro Hashimoto, Takasada Shibauchi
Summary: This study demonstrates the presence of a diverging nematic susceptibility electronic nematic QCP in nonmagnetic FeSe1-x Te-x. In contrast to FeSe1-x S-x, FeSe1-x Te-x exhibits a superconducting dome centered at the QCP. This difference is related to the relative strength of nematic and spin fluctuations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyu Wang, Erez Berg
Summary: Recent Raman scattering experiments have discovered a quasielastic peak in FeSe1-xSx near an Ising-nematic quantum critical point. The peak appears at subtemperature frequencies and softens as temperature decreases towards the quantum critical point. This behavior is inconsistent with impurity scattering and suggests the involvement of quantum critical fluctuations. In this study, the researchers incorporate these effects using a memory matrix approach and find that the quasielastic peak is associated with the relaxation of an Ising-nematic deformation of the Fermi surface. The dynamical scattering rate of this deformation is found to be proportional to the product of the quasielastic peak frequency and the Ising-nematic thermodynamic susceptibility. They also observe a quasilinear dependence of the scattering rate on temperature over a broad temperature range, in agreement with experimental results.
Article
Physics, Multidisciplinary
Jadwiga Szydlowska, Pawel Majewski, Mojca Cepic, Natasa Vaupotic, Paulina Rybak, Corrie T. Imrie, Rebecca Walker, Ewan Cruickshank, John M. D. Storey, Pociecha Damian, Ewa Gorecka
Summary: A critical point was identified in a ferroelectric nematic liquid crystal material where an isotropic phase transforms into a polar nematic phase with increasing electric field. This critical point occurs approximately 30 K above the zero-field transition temperature and at an electric field of around 10 V/μm. Such systems are intriguing for their ability to induce strong birefringence in an optically isotropic phase over a broad temperature range.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Anna E. Boehmer, Jiun-Haw Chu, Samuel Lederer, Ming Yi
Summary: Electronic nematicity, the spontaneous reduction of rotational symmetry in a crystalline solid driven by an electronic mechanism, is an important phenomenon. Iron-based superconductors provide an ideal material platform for studying this phenomenon, and their nematic phase can be studied using a variety of experimental techniques. The understanding of nematicity is crucial for understanding superconducting pairing and normal-state properties.
Article
Physics, Multidisciplinary
Jean-Come Philippe, Alexis Lespinas, Jimmy Faria, Anne Forget, Dorothee Colson, Sarah Houver, Maximilien Cazayous, Alain Sacuto, Indranil Paul, Yann Gallais
Summary: Anisotropic strain selectively affects the role of nematic fluctuations in promoting superconductivity. Our results confirm the significance of nematic fluctuations in electron pairing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Emma C. King, Johannes N. Kriel, Michael Kastner
Summary: We studied the Adiabatic loss in cooling a many-body quantum system towards a quantum critical point. The excitation density that represents the degree of adiabaticity follows scaling laws with cooling velocity, initial, and final temperatures. These scaling laws are universal and depend on the critical exponents of the quantum phase transition. We analytically showed the validity of these statements for a Kitaev quantum wire coupled to Markovian baths and argued their general applicability.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
J. J. Himanshu
Summary: This study investigates the physical characteristics of the 4K superconductor LaCoSi using first-principles density functional theory. It is found that LaCoSi exhibits a ferromagnetic ground state, which contradicts experimental results. Based on calculations, it is suggested that the superconductivity observed in LaCoSi is closely related to a ferromagnetic quantum critical point.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Carolyn Zhang, Michael Levin
Summary: We propose an exactly solvable lattice model to study the deconfined quantum critical point (DQCP) in (1+1) dimensions, which occurs at the edge of a (2+1) dimensional bosonic symmetry protected topological (SPT) phase with 7L2 x 7L2 symmetry. The DQCP describes a transition between two gapped edges that break different 7L2 subgroups of the full 7L2 x 7L2 symmetry. This model provides an exact mapping between the SPT edge theory and a 7L4 spin chain, revealing the close relationship between DQCPs in this system and ordinary 7L4 symmetry breaking critical points.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yangkun He, Romain Sibille, Dong Chen, Johannes Kroder, Toni Helm, Walter Schnelle, Claudia Felser, Gerhard H. Fecher
Summary: The paper reports experimental results on the highly anisotropic magnetic Rh2CoSb, showing that the magnetization, critical temperature, and paramagnetic Curie temperature along the c-axis are higher than those along the a-axis. A simple modification of the Curie-Weiss law was used to calculate the anisotropic theta(p) of not only Rh2CoSb but also many other previously reported ferromagnetic materials.
Article
Chemistry, Physical
J. J. Himanshu, J. J. Pulikkotil
Summary: This study investigates the physical characteristics of the 4 K superconductor LaCoSi using first-principles density functional theory. The results show that the predicted ferromagnetic ground state for LaCoSi disagrees with experimental observations. However, it is suggested that the superconductivity in LaCoSi is closely related to a ferromagnetic quantum critical point.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Long Zhang, Chengxiang Ding
Summary: The nondivergence of the generalized Gruneisen ratio (GR) at a quantum critical point (QCP) is proposed as a universal thermodynamic signature of self-duality. The study explores how the Kramers-Wannier-type self-duality is manifested in the finite-size scaling behavior of thermodynamic quantities in the quantum critical regime. The results indicate that the identification of proper symmetry sectors is necessary for the numerical diagnosis of self-dual QCP.
CHINESE PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Kaizhen Guo, Junyao Ye, Shuyue Guan, Shuang Jia
Summary: We report on the magnetization, specific heat, and electrical resistivity of the newly discovered heavy-fermion compound YbV6Sn6, which has a hexagonal HfFe6Ge6-type structure consisting of a triangular ytterbium sublattice and a kagome vanadium sublattice. Above 2 K, YbV6Sn6 exhibits typical heavy-fermion properties due to the Kondo effect on the Kramers doublet of Yb3+ ions in the crystalline electric field. At TN = 0.40 K, a remarkable magnetic ordering occurs in zero field, but a weak external field suppresses the ordering and induces non-Fermi-liquid behavior. In a strong magnetic field, the compound behaves as a heavy Fermi-liquid state. YbV6Sn6 is one of the few examples of Yb-based heavy-fermion compounds with a triangular Kondo lattice, where a magnetic field induces quantum criticality near zero temperature.
Article
Multidisciplinary Sciences
Sebastian Uhlemann, Baptiste Dafflon, Haruko Murakami Wainwright, Kenneth Hurst Williams, Burke Minsley, Katrina Zamudio, Bradley Carr, Nicola Falco, Craig Ulrich, Susan Hubbard
Summary: This study quantifies the relationships between bedrock geophysical/hydrological properties and geomorphological/vegetation indices using machine learning, based on the covariability analysis of above- and belowground features on a watershed scale. The results show that machine learning can estimate most of their covariability, but regions of lower variability in the input parameters provide better estimates, indicating a limitation of commonly applied geomorphological models.
Article
Materials Science, Multidisciplinary
Li Xiang, Elena Gati, Sergey L. Bud'ko, Scott M. Saunders, Paul C. Canfield
Summary: The pressure-temperature phase diagram of La5Co2Ge3 was constructed up to 5 GPa, showing a change in magnetic behavior and transition to a new low-temperature ground state. This suggests that the ferromagnetic quantum critical point in La5Co2Ge3 is avoided by the appearance of a different, likely magnetically ordered state with an antiferromagnetic component.
Article
Multidisciplinary Sciences
Y. Sato, S. Suetsugu, T. Tominaga, Y. Kasahara, S. Kasahara, T. Kobayashi, S. Kitagawa, K. Ishida, R. Peters, T. Shibauchi, A. H. Nevidomskyy, L. Qian, E. Morosan, Y. Matsuda
Summary: The coupling between charge-neutral excitations and spin degrees of freedom in the Kondo insulator YbIr3Si7 is demonstrated, putting restrictions on current theories. The thermal conductivity and specific heat measurements reveal emergent neutral excitations in YbIr3Si7, which are sensitively changed by a field-driven transition between antiferromagnetic phases.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
M. Berben, S. Smit, C. Duffy, Y-T Hsu, L. Bawden, F. Heringa, F. Gerritsen, S. Cassanelli, X. Feng, S. Bron, E. van Heumen, Y. Huang, F. Bertran, T. K. Kim, C. Cacho, A. Carrington, M. S. Golden, N. E. Hussey
Summary: Once doped away from their parent Mott insulating state, the hole-doped cuprates enter into many varied and exotic phases. The onset temperature of each phase is then plotted versus p-the number of doped holes per copper atom-to form a representative phase diagram. Apart from differences in the absolute temperature scales among the various families, the resultant phase diagrams are strikingly similar. In particular, the p values corresponding to optimal doping and to the end of the pseudogap phase are essentially the same for all cuprate families except for the single-layer Bi-based cuprate Bi2+z-yPbySr2-x-zLaxCuO6+delta (Bi2201). This anomaly arises partly due to the complex stoichiometry of this material and also to the different p values inferred from disparate measurements performed on samples with comparable superconducting transition temperatures T-c. Here, by combining measurements of in-plane resistivity in zero and high magnetic fields with angle-resolved photoemission spectroscopy studies, we argue that the phase diagram of Bi2201 may actually be similar to that realized in other families, supporting the notion of universality of p(opt) and p* in all hole-doped cuprates.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Y. -t. Hsu, M. Osada, B. Y. Wang, M. Berben, C. Duffy, S. P. Harvey, K. Lee, D. Li, S. Wiedmann, H. Y. Hwang, N. E. Hussey
Summary: This study investigates the resistivity behavior in undoped nickelate materials and examines the impact of disorder and doping on its temperature dependence. The results reveal that the level of doping has little correlation with the magnitude and onset temperature of the resistivity upturn, while the different rare-earth families play a crucial role in the evolution of the insulating behavior.
FRONTIERS IN PHYSICS
(2022)
Article
Multidisciplinary Sciences
Kohei Matsuura, Masaki Roppongi, Mingwei Qiu, Qi Sheng, Yipeng Cai, Kohtaro Yamakawa, Zurab Guguchia, Ryan P. Day, Kenji M. Kojima, Andrea Damascelli, Yuichi Sugimura, Mikihiko Saito, Takaaki Takenaka, Kota Ishihara, Yuta Mizukami, Kenichiro Hashimoto, Yilun Gu, Shengli Guo, Licheng Fu, Zheneng Zhang, Fanlong Ning, Guoqiang Zhao, Guangyang Dai, Changqing Jin, James W. Beare, Graeme M. Luke, Yasutomo J. Uemura, Takasada Shibauchi
Summary: Iron-chalcogenide superconductors FeSe1-xSx have unique electronic properties and the nature of superconductivity with nematicity is important for understanding unconventional superconductivity. Recent experiments show that the superconducting state in FeSe1-xSx breaks time-reversal symmetry and exhibits ultranodal pair state. The presence of broken TRS and suppressed superfluid density suggests the existence of two different superconducting states separated by the nematic critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
M. Roppongi, K. Ishihara, Y. Tanaka, K. Ogawa, K. Okada, S. Liu, K. Mukasa, Y. Mizukami, Y. Uwatoko, R. Grasset, M. Konczykowski, B. R. Ortiz, S. D. Wilson, K. Hashimoto, T. Shibauchi
Summary: The recently discovered kagome superconductors AV(3)Sb(5) (A = K, Rb, Cs) exhibit unusual CDW orders with symmetry breaking. The symmetry of the superconductivity inside the CDW phase is still unknown. Impurity effects in CsV3Sb5 were studied using electron irradiation as a phase-sensitive probe, and the results indicate that CsV3Sb5 is a non-chiral, anisotropic s-wave superconductor with no sign change.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Kota Ishihara, Masaki Roppongi, Masayuki Kobayashi, Kumpei Imamura, Yuta Mizukami, Hironori Sakai, Petr Opletal, Yoshifumi Tokiwa, Yoshinori Haga, Kenichiro Hashimoto, Takasada Shibauchi
Summary: Evidence consistent with chiral B-3u+iA(u) spin-triplet superconductivity in UTe2 is found through magnetic penetration depth measurements.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Yoshito Watanabe, Atsushi Miyake, Masaki Gen, Yuta Mizukami, Kenichiro Hashimoto, Takasada Shibauchi, Akihiko Ikeda, Masashi Tokunaga, Takashi Kurumaji, Yusuke Tokunaga, Taka-hisa Arima
Summary: The magnetic phase diagram and double dome structure of a S = 3/2 quantum antiferromagnet is studied, with the importance of different types of magnetic Bose-Einstein condensates discussed. The effects of randomness induced by quenched disorder on the system are also investigated.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Tomoya Asaba, Lang Peng, Takahiro Ono, Satoru Akutagawa, Ibuki Tanaka, Hinako Murayama, Shota Suetsugu, Aleksandar Razpopov, Yuichi Kasahara, Takahito Terashima, Yuhki Kohsaka, Takasada Shibauchi, Masatoshi Ichikawa, Roser Valenti, Shin-ichi Sasa, Yuji Matsuda
Summary: We have discovered a simple method to fabricate atomic-scale wires with various arrangements, including stripes, X-junctions, Y-junctions, and nanorings. These wires are grown on graphite substrates by pulsed-laser deposition and have precise dimensions. Our findings suggest that nonequilibrium reaction-diffusion processes are crucial for the formation of atomic patterns, and this discovery opens up new possibilities for constructing quantum networks at the atomic scale.
Article
Multidisciplinary Sciences
M. Culo, S. Licciardello, K. Ishida, K. Mukasa, J. Ayres, J. Buhot, Y. T. Hsu, S. Imajo, M. W. Qiu, M. Saito, Y. Uezono, T. Otsuka, T. Watanabe, K. Kindo, T. Shibauchi, S. Kasahara, Y. Matsuda, N. E. Hussey
Summary: The authors present high-field magnetotransport measurements of FeSe1-xSx and FeSe1-xTex, which show a broad quantum vortex liquid regime. This indicates the presence of a quantum vortex liquid state and the destruction of the Abrikosov lattice by intense quantum fluctuations at very low temperatures.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Yuta Mizukami, Masahiro Haze, Ohei Tanaka, Kohei Matsuura, Daiki Sano, Jakob Boeker, Ilya Eremin, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi
Summary: The authors use FeSe1-xSx to investigate the evolution of the superconducting state in the BCS-BEC crossover regime and observe the multiband nature of the crossover, as well as a suppression of the nematic order upon S-substitution. Recent experiments suggest that investigations into the BCS-BEC crossover may be possible using strongly correlated systems, in addition to ultracold atomic systems.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Zhongyu Yu, Koya Nakamura, Kazuya Inomata, Xiaoling Shen, Taketora Mikuri, Kohei Matsuura, Yuta Mizukami, Shigeru Kasahara, Yuji Matsuda, Takasada Shibauchi, Yoshiya Uwatoko, Naoki Fujiwara
Summary: The study of FeSe has led to the discovery of spin fluctuations originating from Bogoliubov Fermi surfaces in the superconducting state.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
K. Ishihara, M. Kobayashi, K. Imamura, M. Konczykowski, H. Sakai, P. Opletal, Y. Tokiwa, Y. Haga, K. Hashimoto, T. Shibauchi
Summary: The exotic superconducting properties of the paramagnetic spin-triplet superconductor candidate UTe2, such as extremely high upper critical field and possible chiral superconducting states, have attracted significant attention. This study focuses on the thermodynamic critical field Hc, the lower critical field Hc1, and the upper critical field Hc2 at low fields of ultraclean single crystals of UTe2, providing crucial insight into its intrinsic superconducting properties. Anomalous enhancement of Hc1 values with magnetic field along the b and c axes, showing unusual low-temperature upturns, is attributed to the effect of strong Ising-like ferromagnetic fluctuations on the vortex line energy.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
R. D. H. Hinlopen, F. A. Hinlopen, J. Ayres, N. E. Hussey
Summary: Strange metals exhibit a linear increase in resistivity with magnetic field. The presence of strong anisotropic scattering can generate magnetoresistance, but it saturates at high magnetic field strengths. A bounded sector on the Fermi surface is required for the realization of quadratic-to-linear magnetoresistance.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
J. F. Linnartz, C. S. A. Mueller, Yu-Te Hsu, C. Breth Nielsen, M. Bremholm, N. E. Hussey, A. Carrington, S. Wiedmann
Summary: This study provides a detailed investigation of the magnetic behavior of WTe2, accurately determining its Fermi surface and explaining its unusual electronic properties. The Russian-doll nested Fermi surface model is confirmed, and it is found that impurity damping solely determines the onset of magnetic breakdown in WTe2.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
S. Suetsugu, T. Yokoi, K. Totsuka, T. Ono, I. Tanaka, S. Kasahara, Y. Kasahara, Z. Chengchao, H. Kageyama, Y. Matsuda
Summary: In contrast to recent extensive research on insulating magnets, little is known about the topological phases of charge neutral bosons. This study demonstrates that even relatively weak interparticle interactions seriously influence the topological transport properties at finite temperatures, calling for special attention to the interpretation of the topological bosonic excitations reported for various insulating magnets.