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)
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)
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
Jung-Hwa Kim, Darren C. Peets, Manfred Reehuis, Peter Adler, Andrey Maljuk, Tobias Ritschel, Morgan C. Allison, Jochen Geck, Jose R. L. Mardegan, Pablo J. Bereciartua Perez, Sonia Francoual, Andrew C. Walters, Thomas Keller, Paula M. Abdala, Philip Pattison, Pinder Dosanjh, Bernhard Keimer
Summary: Researchers have discovered checkerboard charge order in the FeO2 planes using neutron Larmor diffraction and Fe K-edge resonant x-ray scattering, which disappears at temperatures above 332 K. Stacking disorder of the checkerboard pattern leads to broader superstructure reflections and reduced amplitudes.
PHYSICAL REVIEW LETTERS
(2021)
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
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
Multidisciplinary Sciences
Nikolaj Roth, Andrew L. Goodwin
Summary: Hidden local order in disordered crystals has a strong impact on electronic and phononic band structures. Local correlations within hidden-order states can open band gaps and change material properties without long-range symmetry breaking. Understanding the importance of hidden order for material properties is crucial, as it offers a new mechanism for tuning material properties orthogonal to conventional structure/property relationships.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
R. Waite, F. Orlandi, D. A. Sokolov, R. A. Ribeiro, P. C. Canfield, P. Manuel, D. D. Khalyavin, C. W. Hicks, S. M. Hayden
Summary: The tetragonal heavy-fermion compound CeAuSb2 undergoes a first-order transition to a spin-density wave (SDW) state under uniaxial stress, resulting in a change in the magnetic structure and a loss of spatial inversion in the metallic system.
Article
Materials Science, Multidisciplinary
V. Scagnoli, D. D. Khalyavin, S. W. Lovesey
Summary: KV3Sb5 has attracted attention due to its low-temperature superconducting properties and the explanation of its properties involves higher-order terms in vanadium magnetization density and a hidden order of Dirac multipoles. There are two viable magnetic structures, one showing magnetoelectric effect and the other not showing any type of magnetoelectric effect.
Article
Multidisciplinary Sciences
D. Subires, A. Korshunov, A. H. Said, L. Sanchez, Brenden R. Ortiz, Stephen D. Wilson, A. Bosak, S. Blanco-Canosa
Summary: The origin and mechanism of the charge density wave in the kagome metal compound AV(3)Sb(5) is still under intense debate. By combining diffuse and inelastic x-ray scattering techniques, this study shows that the charge density wave transition in (Cs,Rb)V3Sb5 is of the order-disorder type. The experimental data indicate that the CDW consists of alternating Star of David and trihexagonal distortions.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Peter Thalmeier
Summary: The quantum magnetism in a three-singlet model (TSM) is investigated, finding that induced magnetic moments appear due to singlet-singlet mixing at the ordering temperature T-m. The transition is mostly of second order, but it can become first-order at a critical point. Excitonic mode spectrum, quantum critical soft mode behavior, and temperature dependence of order parameters are derived for the induced magnetic phase.
Article
Biochemistry & Molecular Biology
Augusta de Santis, Ernesto Scoppola, Maria Francesca Ottaviani, Alexandros Koutsioubas, Lester C. Barnsley, Luigi Paduano, Gerardino D'Errico, Irene Russo Krauss
Summary: The structural properties of cholesterol-containing lipid bilayers with increasing amounts of polyunsaturated omega-3 lipids were investigated using multiple techniques in this study. Results indicate that the different effects of hybrid and symmetric omega-3 phospholipids on lipid bilayers' microscopic organization, with cholesterol able to suppress non-lamellar structures induced by symmetric polyunsaturated lipids. The structural organization of the resulting bilayer does not fit neatly into typical liquid ordered or liquid disordered phases, showing loose packing of lipid chain segments.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
M. C. Rahn, A. Gallagher, F. Orlandi, D. D. Khalyavin, C. Hoffmann, P. Manuel, R. Baumbach, M. Janoschek
Summary: The hidden order phase in URu2Si2 is highly sensitive to electronic doping, and the substitution of silicon with phosphorus can isolate the effects of tuning the chemical potential to some extent. This substitution induces a new antiferromagnetic phase with localized magnetic moments, and enhanced exchange interactions due to chemical pressure lead to magnetic order. Comparison with other tuning studies of URu2Si2 helps delineate the mechanisms by which silicon-to-phosphorus substitution affects the system.
Article
Materials Science, Multidisciplinary
Anil Kumar, M. Kamal Warshi, Archna Sagdeo, Matthew Krzystyniak, Svemir Rudic, D. T. Adroja, Ivan da Silva, P. R. Sagdeo
Summary: The study reports a possible origin of natural and magnetic field induced polar order in PrFe1/2Cr1/2O3, attributed to an increase in the delocalization of Pr3+ ions and strong spin-phonon coupling. These results contribute significantly to understanding ferroelectric polarization and progress in the search for room-temperature magnetodielectric materials.
Article
Physics, Multidisciplinary
Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Yoshinori Haga, Yoshifumi Tokiwa, Petr Opletal, Hiroki Fujibayashi, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Te-125 NMR experiments in UTe2 reveal slow electronic dynamics in the paramagnetic state, which are associated with the growth of long-range electronic correlations at low temperatures. The experiments also show that disorder or defects disturb the long-range electronic correlations, leading to an inhomogeneous electronic state.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Physics, Multidisciplinary
Aki Kitaori, Naoya Kanazawa, Takanori Kida, Yasuo Narumi, Masayuki Hagiwara, Koichi Kindo, Tetsuya Takeuchi, Ai Nakamura, Dai Aoki, Yoshinori Haga, Yoshio Kaneko, Yoshinori Tokura, Yoshichika O. Nuki
Summary: We have successfully grown single crystalline Tb5Sb3 with a hexagonal structure, which exhibits complex spiral magnetic structures with changing temperature. Specific heat and magnetization measurements revealed one clear magnetic transition at 133 K. The magnetic structure is oriented in the hexagonal basal plane with a hard axis corresponding to the [0001] direction. Below 50 K, the magnetic structure undergoes a transformation, leading to a rapid decrease in magnetic susceptibility for H II [1010] and a kink behavior in low-field magnetization, while showing hysteresis in the magnetization curve.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Petr Opletal, Hironori Sakai, Yoshinori Haga, Yoshifumi Tokiwa, Etsuji Yamamoto, Shinsaku Kambe, Yo Tokunaga
Summary: We studied the physical properties of a single crystal of uranium telluride U7Te12. It was found that U7Te12 crystallizes in a hexagonal structure with three different crystallographic uranium sites. The paramagnetic moments were estimated to be approximately 1 µB per uranium site assuming a uniform moment on all the sites. A ferromagnetic phase transition occurred at TC = 48 K, with a sharp increase in in-plane magnetization while the out-of-plane component did not increase significantly. Further below TC under field-cooling conditions, the out-of-plane component increased rapidly around T* = 26 K, while the in-plane component showed little change at T*. Specific heat measurement indicated a crossover suggesting a reorientation of ordering moments or successive magnetic ordering of the multiple uranium sites.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
Hiroki Matsumura, Hiroki Fujibayashi, Katsuki Kinjo, Shunsaku Kitagawa, Kenji Ishida, Yo Tokunaga, Hironori Sakai, Shinsaku Kambe, Ai Nakamura, Yusei Shimizu, Yoshiya Homma, Dexin Li, Fuminori Honda, Dai Aoki
Summary: Spin susceptibility in the superconducting state of uranium-based superconductor UTe2 was measured. The higher-quality sample exhibited a higher Tc and a narrower NMR linewidth compared to the previous sample. A significant reduction in Knight shift along the a axis was observed, which differed from the previous results along the alpha axis. The origin of these differences and the possible implications for the superconducting state were discussed.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Physics, Multidisciplinary
H. Sakai, Y. Tokiwa, P. Opletal, M. Kimata, S. Awaji, T. Sasaki, D. Aoki, S. Kambe, Y. Tokunaga, Y. Haga
Summary: The superconducting phase diagram in uranium ditelluride was investigated using high-quality single crystals under magnetic fields along the hard magnetic b axis. Low-field and high-field superconducting phases with different field-angular dependence were distinguished through electrical resistivity and ac magnetic susceptibility measurements. The crystal quality affected the upper critical field of the low-field superconducting phase, but the H* value at which the high-field superconducting phase appeared remained the same across different crystals. A phase boundary signature was also observed inside the low-field superconducting phase near H*, indicating the presence of an intermediate superconducting phase characterized by small flux pinning forces.
PHYSICAL REVIEW LETTERS
(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
Kyugo Ota, Yuki Watabe, Yoshinori Haga, Fabio Iesari, Toshihiro Okajima, Yuji Matsumoto
Summary: Asymmetry plays an important role in discovering new phenomena, and the honeycomb structure is an example of asymmetric structure. The crystal structure analysis of Ce2Pt6Al15 is difficult due to stacking disorder, but we successfully synthesized polycrystalline Ce2Pt6Al15 and single-crystalline Ce2Pt6Al15. The analysis of the samples confirmed the trivalent valence of Ce in Ce2Pt6Al15 and revealed an orthorhombic structure with honeycomb structure.
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
Materials Science, Multidisciplinary
Yukiharu Takeda, Jiri Pospisil, Hiroshi Yamagami, Etsuji Yamamoto, Yoshinori Haga
Summary: The element-specific electronic states and magnetic properties of UCoGe and Ru-substituted U(Co0.88Ru0.12)Ge were investigated using soft x-ray magnetic circular dichroism experiments. The results show that the Co 3d electrons play an important role in these compounds.
Article
Materials Science, Multidisciplinary
Ikuto Kawasaki, Kazuharu Takeuchi, Shin-ichi Fujimori, Yukiharu Takeda, Hiroshi Yamagami, Etsuji Yamamoto, Yoshinori Haga
Summary: Angle-resolved photoemission spectroscopy (ARPES) experiments were performed to investigate the electronic structure of the heavy-fermion superconductor UPt3. The band structure of UPt3 was compared with density-functional calculations for ThPt3, and it was found that ThPt3 calculations provided a better description of the experimental band structure except for the heavy quasiparticle bands derived from 5f orbitals. The heavy quasiparticle bands were found to be renormalized by electron correlation effects and showed little temperature dependence.
Article
Materials Science, Multidisciplinary
Shin-ichi Fujimori, Yukiharu Takeda, Hiroshi Yamagami, Jiri Pospisil, Etsuji Yamamoto, Yoshinori Haga
Summary: The electronic structure of ThPd2Al3 has been investigated using photoelectron spectroscopy. The results suggest that the Fermi surface mainly consists of Al 3p and Th 6d states, with a minor contribution from Pd 4d states. Comparison with UPd2Al3 indicates that the Fermi surface of UPd2Al3 has a strong three-dimensional nature.
