Article
Chemistry, Physical
Benjamin Cohen-Stead, Kipton Barros, Richard Scalettar, Steven Johnston
Summary: This study investigates the relationship between electron-phonon interactions and charge-density-wave order in the bismuthate family of high-temperature superconductors. The results demonstrate that coupling to the bond-stretching modes is sufficient to reproduce the CDW transition in this system, despite a relatively small coupling. Additionally, the transition deviates from the weak-coupling Peierls' picture. This work highlights the importance of off-diagonal e-ph interactions in establishing the bismuthate phase diagram.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
S. Mishra, Y. Liu, E. D. Bauer, F. Ronning, S. M. Thomas
Summary: We report anisotropic resistivity measurements of the heavy-fermion superconductor CeRh2As2 in magnetic fields up to 16 T and temperatures down to 0.35 K. The resistivity measurements show a signature corresponding to the quadrupole-density-wave order state and reveal a magnetic field-induced transition. These results suggest a close relationship between the multiple superconducting phases and the quadrupole-density-wave phase in CeRh2As2.
Article
Materials Science, Multidisciplinary
Wen-He Jiao, Shaozhu Xiao, Bin Li, Chunqiang Xu, Xiao-Meng Xie, Hang-Qiang Qiu, Xiaofeng Xu, Yi Liu, Shi-Jie Song, Wei Zhou, Hui-Fei Zhai, X. Ke, Shaolong He, Guang-Han Cao
Summary: The study reports on the unique properties of TaPtTe5 crystals, which exhibit anisotropic magnetoresistance and nonlinear Hall effect at low temperatures, indicating a nontrivial band topology.
Article
Multidisciplinary Sciences
Ilya Shipulin, Nadia Stegani, Ilaria Maccari, Kunihiro Kihou, Chul-Ho Lee, Quanxin Hu, Yu Zheng, Fazhi Yang, Yongwei Li, Chi-Ming Yim, Ruben Huehne, Hans-Henning Klauss, Marina Putti, Federico Caglieris, Egor Babaev, Vadim Grinenko
Summary: The study discovered a new fermionic quadrupling condensate that breaks the Z(2) time-reversal symmetry. By detecting the specific heat, researchers found specific anomalies above the superconducting critical temperature, which are associated with the broken time-reversal symmetry.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Nader Zaki, Genda Gu, Alexei Tsvelik, Congjun Wu, Peter D. Johnson
Summary: Topological superconductivity has been discovered in the high-Tc family of superconductors FeTe1-xSex, with evidence of Majorana fermions in the surface state. High-resolution laser-based photo-emission studies have revealed the interplay of topology, magnetism, and superconductivity in this system, showing the potential for exotic topological phenomena.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Polymer Science
Haidong Shi, Yanling Yang, Yanping Huang, Xuke Li, Yue Shi
Summary: In this study, an anisotropic single-domain hydrogel with lyotropic liquid crystal property and thermochromism was fabricated by combining hydroxypropyl cellulose (HPC) with a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) hydrogel through mechanical shearing. The prepared long-range ordered HPC- PNIPAM hydrogels exhibited bright and uniform interference colors between crossed polarizers, and showed stimulus-responsive behavior to temperature and ionic strength. Particularly, the oriented HPC- PNIPAM hydrogel had a wide thermoresponsive range that could be adjusted by the HPC and PNIPAM content, providing a solution to the narrow or fixed temperature sensing range of hydrogels.
Article
Multidisciplinary Sciences
Hanqin Ding, Yan Xu, Weiting Chen
Summary: The one-dimensional antiferromagnetic correlated electron system described by the unusual t-U-J model with alternating on-site interactions at odd and even sites exhibits insulating behavior due to unequal on-site repulsion. Depending on the value of Ue+Uo in relation to 2J, the system can be in a spin-gapped phase with charge-density-wave instability or a spin-gapless phase with coexisting CDW and SDW instabilities.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Minori Hashizume, Tomoyuki Yokouchi, Kurea Nakagawa, Yuki Shiomi
Summary: FeGe2, an antiferromagnetic semimetal, exhibits a positive Seebeck coefficient under a strong magnetic field, showing an anisotropic magneto-Seebeck effect.
Article
Multidisciplinary Sciences
Thomas Hartke, Botond Oreg, Carter Turnbaugh, Ningyuan Jia, Martin Zwierlein
Summary: The Hubbard model of attractively interacting fermions is used to study fermion pairing. In this model, a crossover between tightly bound pairs and long-range Cooper pairs occurs, with a pseudo-gap region above the superfluid critical temperature. By directly observing a Hubbard lattice gas of fermionic potassium-40 atoms under a bilayer microscope, the nonlocal nature of fermion pairing is revealed. The study also provides insights into the pseudo-gap behavior in strongly correlated fermion systems.
Article
Physics, Multidisciplinary
Seher Karakuzu, Andy Tanjaroon Ly, Peizhi Mai, James Neuhaus, Thomas A. Maier, Steven Johnston
Summary: This study investigates stripe orders in the doped single-band Hubbard-Holstein model and finds that the lattice couples more strongly with the charge component of the stripes, leading to an enhancement or suppression of stripe correlations depending on model parameters. This has implications for our understanding of high-Tc cuprates.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Physical
W. H. Liu, X. L. Yi, W. C. Li, X. Z. Xing, H. J. Zhao, M. X. Xu, Z. X. Shi
Summary: Based on high quality FeSe1-xSx (0 <= x <= 1) single crystals, the evolution of the mobility spectrum and its relationship with temperature, doping content, and structural factors were investigated. The nonlinear to linear transition of Hall resistivity was attributed to changes in mobility and merging of mobility peaks. The correlation between Tc and carrier density showed weak interaction in the orthogonal phases but a nearly positive correlation in the tetragonal phases. The bond angle and anion height exhibited linear changes with doping content, and their relationship with Tc indicated the importance of structural factors in regulating superconductivity. This research contributes to the understanding of the multi-band and complex phase diagram of iron-based superconductors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Yanpeng Qi, Tianping Ying, Xianxin Wu, Zhuoya Dong, Masato Sasase, Qing Zhang, Weiyan Liu, Masaki Ichihara, Yanhang Ma, Jiangping Hu, Hideo Hosono
Summary: The study reports the discovery of an unprecedented vacancy state forming an extended buckled-honeycomb-vacancy (BHV) ordering in Ir16Sb18, which leads to superconductivity by suppressing the BHV ordering. Further theoretical calculations suggest that the buckled structure breaks the crystal inversion symmetry and can mostly suppress the density of states near the Fermi level.
Article
Materials Science, Multidisciplinary
Fengmiao Li, Ilya Elfimov, George A. Sawatzky
Summary: The discovery of higher-temperature superconductivity in FeSe monolayers on SrTiO3 substrates has sparked a surge of interest in interface superconductivity. The study finds that modulation doping by impurities in the substrate is critical for enhancing superconductivity, and there is likely an important interaction limiting the FeSe doping. Furthermore, the polarization change of the interface Se and the titanate substrate acting as a charge reservoir play important roles in the interface superconductivity.
Review
Chemistry, Multidisciplinary
Denys Makarov, Oleksii M. Volkov, Attila Kakay, Oleksandr V. Pylypovskyi, Barbora Budinska, Oleksandr V. Dobrovolskiy
Summary: This article discusses the impact of curvilinear geometry in various fields and outlines the future research prospects of curvilinear solid-state systems, with a focus on the latest developments and current challenges in curvilinear micro- and nanostructures, as well as new physics research directions and strong application potential.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sudip Pokharel, Huaxiang Fu
Summary: The study found that the local magnetic moment significantly stabilizes the FeSe system and induces a strong magnetostriction effect. Furthermore, the LMM substantially alters the electron band structures and Fermi surfaces in the superconductor, leading to rich and interesting physics that can be tuned.
Article
Chemistry, Physical
D. Reuter, P. Muenzner, C. Gainaru, P. Lunkenheimer, A. Loidl, R. Boehmer
Summary: Research found a close coupling between ionic and molecular motions in typical deep eutectic solvents, but in some cases decoupling is possible. In addition, at low temperatures, the ionic conductivity of certain deep eutectic solvents is significantly enhanced.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Chi Ming Yim, Soumendra Nath Panja, Christopher Trainer, Craig Topping, Christoph Heil, Alexandra S. Gibbs, Oxana Magdysyuk, Vladimir Tsurkan, Alois Loidl, Andreas W. Rost, Peter Wahl
Summary: The passage discusses the tuning of the ground state of the nonsuperconducting parent compound, Fe1+xTe, of the iron chalcogenides by uniaxial strain, highlighting the peculiar (pi, 0) antiferromagnetic order exhibited by iron telluride. The study demonstrates a transition to a (pi, pi)-charge-ordered state on the surface of Fe1.1Te under strain, showcasing the opportunities offered by 2D correlated phases near surfaces and interfaces.
Review
Physics, Multidisciplinary
Vladimir Tsurkan, Hans-Albrecht Krug Von Nidda, Joachim Deisenhofer, Peter Lunkenheimer, Alois Loidl
Summary: Spinel compounds exhibit diverse properties, serving technological applications, gemstone purposes, and geological/astronomical studies, while their research contributes significantly to the understanding of magnetism, orbitals, charges, and other related fields.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
M. A. Belyanchikov, Z. Bedran, M. Savinov, P. Bednyakov, P. Proschek, J. Prokleska, V. A. Abalmasov, E. S. Zhukova, V. G. Thomas, A. Dudka, A. Zhugayevych, J. Petzelt, A. S. Prokhorov, V. B. Anzin, R. K. Kremer, J. K. H. Fischer, P. Lunkenheimer, A. Loidl, E. Uykur, M. Dressel, B. Gorshunov
Summary: This study investigates the collective modes and single-particle excitations of water molecules confined within nanocages using comprehensive broad-band dielectric spectroscopy, specific heat studies, and molecular dynamics and Monte Carlo simulations. The results show that the confined water molecules exhibit rich anisotropic temperature-dependent excitations, and a ferroelectric order-disorder phase transition is confirmed at approximately 3 K.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
C. Trainer, C. M. Yim, C. Heil, L. S. Farrar, V Tsurkan, A. Loidl, P. Wahl
Summary: The study demonstrates that helium affects the spin polarization of tunneling current and magnetic contrast, can be ejected from the tunneling junction by tunneling electrons, and the microscope is sensitive to magnetic exchange interactions. The time-averaged spin polarization of the tunneling current is suppressed in the presence of helium, showing voltage control of spin polarization.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
D. Takegami, C-Y Kuo, K. Kasebayashi, J-G Kim, C. F. Chang, C. E. Liu, C. N. Wu, D. Kasinathan, S. G. Altendorf, K. Hoefer, F. Meneghin, A. Marino, Y. F. Liao, K. D. Tsuei, C. T. Chen, K-T Ko, A. Guenther, S. G. Ebbinghaus, J. W. Seo, D. H. Lee, G. Ryu, A. C. Komarek, S. Sugano, Y. Shimakawa, A. Tanaka, T. Mizokawa, J. Kunes, L. H. Tjeng, A. Hariki
Summary: We present a comprehensive study of CaCu3Ru4O12 using bulk sensitive hard and soft x-ray spectroscopy combined with local-density approximation + dynamical mean-field theory (DMFT) calculations. Correlation effects on both the Cu and Ru ions can be observed. Based on the analysis of Cu 2p corelevel spectra, we infer the presence of magnetic Cu2+ ions hybridized with itinerant electrons. The photon energy dependence of the valence band allows us to optimize the DMFT calculations, indicating that CaCu3Ru4O12 can be classified as a Kondo system with a Kondo temperature in the range of 500-1000 K.
Article
Materials Science, Multidisciplinary
S. Reschke, D. G. Farkas, A. Strinic, S. Ghara, K. Guratinder, O. Zaharko, L. Prodan, V Tsurkan, D. Szaller, S. Bordacs, J. Deisenhofer, I Kezsmarki
Summary: Magnetoelectric phenomena are closely related to relativistic effects and require the breaking of spatial inversion symmetry and time-reversal invariance in materials. The optical magnetoelectric effect in materials with non-parallel magnetization and electric polarization generates a trilinear term in the refractive index, which can significantly affect light-matter interaction and lead to non-reciprocal light propagation. Co2Mo3O8, with its sharp magnetoelectric resonances in the terahertz regime, is an ideal compound to demonstrate this fundamental relation.
NPJ QUANTUM MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Julian Wagner, Anuja Sahasrabudhe, Rolf B. Versteeg, Lena Wysocki, Zhe Wang, Vladimir Tsurkan, Alois Loidl, Daniel Khomskii, Hamoon Hedayat, Paul H. M. van Loosdrecht
Summary: The evolution of the zigzag order parameter in alpha-RuCl3 is studied, revealing the presence of metamagnetic transitions and the emergence of an intermediate phase induced by a magnetic field. The results provide a quantitative description of the bond-anisotropic interactions in alpha-RuCl3.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Peter Lunkenheimer, Alois Loidl, Birte Riechers, Alessio Zaccone, Konrad Samwer
Summary: The Lindemann criterion applies to the melting of crystals but not to glasses. There is a universal relationship between glass temperature and thermal expansion. The thermal expansion coefficient of glasses behaves differently from crystals, indicating a liquid-solid cross-over in glasses.
Article
Chemistry, Physical
P. Lunkenheimer, A. Loidl, G. P. Johari
Summary: By using dielectric spectroscopy, we investigated dipolar relaxations, dc conductivity, and polar order in AgCN. The conductivity contribution dominates at high temperatures and low frequencies, originating from silver ions' mobility. We observed dipolar relaxation of CN- ions and found a phase with quadrupolar order in AgCN, indicating dipolar head-to-tail disorder of the CN- ions at elevated temperatures. Under about 475 K, a long-range polar order of the CN dipole moments emerges.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Verena Schiller, Katharina Knippen, Alois Loidl, Peter Lunkenheimer, Dirk Volkmer, Michael Vogel
Summary: We used H-2 nuclear magnetic resonance (NMR) to investigate the reorientation and diffusion of water in the metal-organic framework MFU-4l. The study revealed that the rotational correlation times follow different relations above and below certain temperatures, with a continuous evolution in between. The NMR results were consistent with previous broadband dielectric spectroscopy (BDS) data on water in a similar framework. The water dynamics at low temperatures did not fully restore ergodicity, suggesting the presence of spatially heterogeneous water properties.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
F. Schilberth, N. Unglert, L. Prodan, F. Meggle, J. Ebad Allah, C. A. Kuntscher, A. A. Tsirlin, V Tsurkan, J. Deisenhofer, L. Chioncel, I Kezsmaerki, S. Bordacs
Summary: This study investigates the quantum Hall effect and anomalous Hall effect in kagome materials, and probes the band structure features through optical conductivity spectra. The results show that low-energy transitions contribute significantly to the anomalous Hall effect, which is further enhanced by contributions from higher-energy interband transitions. The study also reveals band reconstructions near the Fermi level due to local Coulomb interactions.
Article
Physics, Fluids & Plasmas
K. L. Ngai, S. Capaccioli, P. Lunkenheimer, A. Loidl
Summary: This paper critically compares four major interpretations to identify the most plausible interpretation of the relaxation processes observed in the dielectric spectra of glycerol.
Article
Chemistry, Physical
Julian Wagner, Anuja Sahasrabudhe, Rolf Versteeg, Zhe Wang, Vladimir Tsurkan, Alois Loidl, Hamoon Hedayat, Paul H. M. van Loosdrecht
Summary: We have conducted time-resolved magneto-optical spectroscopy on the magnetic Mott-Hubbard-insulating Kitaev spin liquid candidate α-RuCl3 to investigate the non-equilibrium dynamics of its antiferromagnetically ordered zigzag groundstate after photoexcitation. Our findings reveal the dynamical interplay of charge excitations with the zigzag ordered state on ultrashort time scales, and the existence of a long-lived non-thermal antiferromagnetic spin-disordered state. These results have implications for the study of nonequilibrium states in strongly correlated materials.
FARADAY DISCUSSIONS
(2022)
Article
Materials Science, Multidisciplinary
L. Prodan, S. Yasin, A. Jesche, J. Deisenhofer, H-A Krug Von Nidda, F. Mayr, S. Zherlitsyn, J. Wosnitza, A. Loidl, V Tsurkan
Summary: The multiferroic spinel FeCr2S4 displays a magnetic-field-induced spin-reorientation transition at low temperatures, indicating a competition between spin-orbit and Jahn-Teller interactions. At 2K, the magnetization and sound velocity show abrupt changes, suggesting a first-order magnetostructural transformation. The reduction of magnetic anisotropy and changes in structural symmetry below the Jahn-Teller transition are attributed to the tuning of spin-orbit and Jahn-Teller interactions by external magnetic fields.
