Article
Materials Science, Multidisciplinary
H. Yamaguchi, N. Uemoto, T. Okubo, Y. Kono, S. Kittaka, T. Sakakibara, T. Yajima, S. Shimono, Y. Iwasaki, Y. Hosokoshi
Summary: The model compound with a spin-1/2 frustrated square lattice exhibits unique magnetization curve and magnetic characteristics, indicating the presence of one-dimensional antiferromagnetic correlations. A gapless phase induced by the magnetic field transitioned to an ordered state with 2D characteristics. These results extend the spin-1 Haldane state to a 2D system, showing that the gapped ground state in the spin-1/2 frustrated square lattice is due to frustration-induced one-dimensionalization.
Article
Materials Science, Multidisciplinary
Arkadeb Pal, C. H. Huang, T. W. Yen, P. H. Lee, Y. H. Chang, C. H. Yeh, T. W. Kuo, Ajay Tiwari, D. Chandrasekhar Kakarla, S. M. Huang, M. C. Chou, H. S. Kunwar, S. Rana, V. G. Sathe, B. H. Chen, Y. C. Chuang, H. D. Yang
Summary: This study reports a spectrum of phenomena induced by helical spin ordering in a noncentrosymmetric and spin-frustrated system Fe-3(PO4)O-3, including magnetodielectric effect, magnetostriction effect, and spin-phonon coupling.
Article
Materials Science, Multidisciplinary
Zhen Zhao, Claudio Verdozzi, Ferdi Aryasetiawan
Summary: The self-consistent Green's function method is used to study the ground state spin patterns and magnetic structure factors of two-dimensional magnetic systems with frustrated spin-1/2 Heisenberg exchange coupling. The method shows improved accuracy compared to random phase approximation treatments in the case of scalar product interactions, while higher corrections are needed for cross-product interactions. The results indicate the potential advantages of this method in describing systems with a large number of atoms and long-range interactions.
Article
Materials Science, Multidisciplinary
F. Landolt, K. Povarov, Z. Yan, S. Gvasaliya, E. Ressouche, S. Raymond, V. O. Garlea, A. Zheludev
Summary: In this study, single-crystal elastic and inelastic neutron-scattering experiments were conducted on the frustrated ferroantiferromagnet SrZnVO(PO4)2 under high magnetic fields. The results showed significant deviations from classical spin-wave theory, including renormalization of spin-wave bandwidths, redistributions of intensities between different branches, and nonlinearities in the magnetization curve. The previously observed presaturation transition was attributed to a staggered pattern of Dzyaloshinskii-Moriya interactions.
Article
Materials Science, Multidisciplinary
F. Landolt, Z. Yan, S. Gvasaliya, K. Beauvois, E. Ressouche, J. Xu, A. Zheludev
Summary: Single crystals of the frustrated S = 1/2 ferro-antiferromagnetic proximate square lattice material SrZnVO(PO4)2 were studied in various experiments, revealing magnetic frustration and quantum renormalization of exchange constants. A novel presaturation phase was observed in the H-T magnetic phase diagram, showing similarities and differences with a previously studied compound.
Article
Materials Science, Multidisciplinary
M. Pregelj, A. Zorko, D. Arcon, M. Klanjsek, N. Jansa, P. Jeglic, O. Zaharko, S. Kraemer, M. Horvatic, A. Prokofiev
Summary: In this study, a comprehensive investigation of β-TeVO4 using nuclear magnetic resonance technique reveals the dynamic nature of spin-density-wave (SDW) and spin-stripe phases in this material. In the high-field phase, the arrangement of magnetic moments is similar to that of the SDW phase, possibly stabilized by magnetic anisotropy.
Article
Physics, Multidisciplinary
Yuting Tan, Dao-Xin Yao
Summary: We investigate the effects of long-range interactions on the spin wave spectra and competition between magnetic phases on a frustrated square lattice. Analytical expressions for spin wave spectra are obtained for systems with competing Neel and (pi, o) stripe states, under any-order long-range interactions. Surprisingly, staggered long-range interaction suppresses quantum fluctuation and enlarges the ordered moment, extending the phase boundary between Neel and stripe states.
FRONTIERS OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yuan Gao, Yu-Chen Fan, Han Li, Fan Yang, Xu-Tao Zeng, Xian-Lei Sheng, Ruidan Zhong, Yang Qi, Yuan Wan, Wei Li
Summary: The recently synthesized NBCP compound is found to be an ideal realization of a S = 1/2 triangular-lattice antiferromagnet with significant easy-axis spin exchange anisotropy. By combining automatic parameter searching and tensor-network simulations, a microscopic model is established to accurately describe the material's properties, fitting well with experimental data.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Fei Ding, Yongxiang Ma, Xiangnan Gong, Die Hu, Jun Zhao, Lingli Li, Hui Zheng, Yao Zhang, Yongjiang Yu, Lichun Zhang, Fengzhou Zhao, Bingying Pan
Summary: A new frustrated triangular lattice antiferromagnet Na2BaNi(PO4)(2) was synthesized, showing potential spin liquid characteristics with substantial residual magnetic entropy at low temperatures. The experiment results indicate the presence of low energy spin excitations in the material.
Article
Materials Science, Multidisciplinary
A. V. Syromyatnikov
Summary: In this study, a spin-1/2 Heisenberg antiferromagnet on the triangular lattice was discussed using the bond-operator technique (BOT). It was found that high-energy collective excitations and another high-energy quasiparticle exist in the system. Quantum fluctuations considerably alter the properties of conventional magnons, and the anomalous spin dynamics observed experimentally recently cannot be described by SWT.
Article
Physics, Multidisciplinary
L. M. Volkova
Summary: A structural-magnetic model for the orthorhombic and triclinic modifications of Cu4O(AsO4)(2) and Cu4O(PO4)(2) has been constructed and analyzed. These compounds exhibit complex ribbon structures composed of antiferromagnetic Cu-4 tetrahedra. Both modifications are found to be strongly frustrated 3D antiferromagnetics due to competing interactions. The presence of a possible Dzyaloshinskii-Moriya interaction in the orthorhombic modification and the centrosymmetric nature of the triclinic modification affect the magnetic behaviors of these compounds.
Article
Nanoscience & Nanotechnology
K. Boya, K. Nam, K. Kargeti, A. Jain, R. Kumar, S. K. Panda, S. M. Yusuf, P. L. Paulose, U. K. Voma, E. Kermarrec, Kee Hoon Kim, B. Koteswararao
Summary: A quantum spin-liquid state, characterized by spin disorder, has been discovered in the compound KSrFe2(PO4)(3), which exhibits a three-dimensional frustrated spin network with gapless excitations despite having a large spin moment of S = 5/2.
Article
Materials Science, Multidisciplinary
K. M. Ranjith, F. Landolt, S. Raymond, A. Zheludev, M. Horvatic
Summary: The study on the presaturation phase in SrZnVO(PO4)(2) revealed two pieces of evidence against the presumed spin-nematic character: NMR spectra showed dipolar spin order, and T-1(-1) relaxation rate data above the saturation field could be fitted by a simple formula, leaving no space for nematic spin dynamics.
Article
Materials Science, Multidisciplinary
Cheng Gu, Shun-Li Yu, Jian-Xin Li
Summary: We employ the spin cluster perturbation theory to investigate the dynamical properties of the antiferromagnetic J1-J2 Heisenberg model on the honeycomb lattice. We obtain the excitation spectra for all possible phases in the phase diagram, including the Neel phase, plaquette valence-bond-solid phase, dimer valence-bond-solid phase, and stripe antiferromagnetic phase. In different phases, we find characteristic spectra and provide an explanation for the spectral features.
Article
Materials Science, Multidisciplinary
Yuki Kojima, Nobuyuki Kurita, Hidekazu Tanaka, Kenji Nakajima
Summary: This article reports on the magnetic orderings and excitations in Ba2CoTeO6 composed of two subsystems. The excitation spectra of both subsystems are independent and well separated. The Ising-like subsystem shows stripy ordering, while the other subsystem exhibits elastic scattering.
Article
Materials Science, Multidisciplinary
Tobias Biesner, Weiwu Li, Alexander A. Tsirlin, Seulki Roh, Pai-Chun Wei, Ece Uykur, Martin Dressel
Summary: Pressure-sensitive spectroscopy measurements have revealed promising ways to tune semiconducting materials for energy harvesting and advanced electronic applications. Researchers have characterized SnSe crystals under high pressures to map out the appearance and influence of multivalleys on properties like phase transitions and energy conversion.
NPG ASIA MATERIALS
(2021)
Review
Physics, Condensed Matter
Alexander A. Tsirlin, Philipp Gegenwart
Summary: This article reviews the progress in studying and understanding the Kitaev model on lithium iridate Li2IrO3, as well as discussing the feasibility, effectiveness, and repercussions of tuning strategies based on external pressure and chemical substitutions.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Valeriy Yu Verchenko, Alexander A. Tsirlin
Summary: Narrow-gap semiconductors can be found in the IrIn3 family of intermetallic compounds. The electronic structures of these compounds exhibit pseudo and real gaps at specific valence electron counts, and the metallic state can have comparable or higher thermodynamic stability than the semiconducting state.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Ece Uykur, Brenden R. Ortiz, Stephen D. Wilson, Martin Dressel, Alexander A. Tsirlin
Summary: In this study, we discover unconventional localized carriers with strong renormalization across the density-wave transition in KV3Sb5 through optical spectroscopy and density-functional calculations. We also observe strong phonon anomalies not only below the density-wave transition, but also at high temperatures, indicating a complex interplay between phonons and the underlying electronic structure. We propose star-of-David and tri-hexagon configurations for the density-wave order in KV3Sb5, which resemble the p-wave states expected in the Hubbard model on the kagome lattice with van Hove singularity filling.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Alexander A. Tsirlin, Pierre Fertey, Brenden R. Ortiz, Berina Klis, Valentino Merkl, Martin Dressel, Stephen D. Wilson, Ece Uykur
Summary: The pressure evolution of the superconducting kagome metal CsV3Sb5 is studied using experimental and computational methods. The results show that pressure leads to a highly anisotropic compression due to the fast shrinkage of the Cs-Sb distances and suppression of Cs rattling motion. Additionally, it is found that Sb atoms play a central role in stabilizing the three-dimensional charge-density wave and Fermi surface reconstruction.
Article
Physics, Applied
Akshata Magar, K. Somesh, Vikram Singh, J. J. Abraham, Y. Senyk, A. Alfonsov, B. Buechner, V Kataev, A. A. Tsirlin, R. Nath
Summary: This study reports the single-crystal growth, magnetic properties, and magnetocaloric effect of the S = 3/2 kagome ferromagnet Li9Cr3(P2O7)(3)(PO4)(2). The research reveals the dominant ferromagnetic intraplane coupling, the presence of short-range correlations, and a large magnetocaloric effect characterized by significant cooling power and negligible hysteresis.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
A. Revelli, M. Moretti Sala, G. Monaco, M. Magnaterra, J. Attig, L. Peterlini, T. Dey, A. A. Tsirlin, P. Gegenwart, T. Froehlich, M. Braden, C. Grams, J. Hemberger, P. Becker, P. H. M. van Loosdrecht, D. I. Khomskii, J. van den Brink, M. Hermanns, M. Grueninger
Summary: Ba3InIr2O9 is a promising candidate for quantum spin-liquid behavior and exhibits magnetism from spin-orbit entangled quasimolecular moments. Our study reveals its unique electronic states and excitations through various experimental and computational methods.
Article
Materials Science, Multidisciplinary
M. Wenzel, B. R. Ortiz, S. D. Wilson, M. Dressel, A. A. Tsirlin, E. Uykur
Summary: Temperature-dependent reflectivity studies have been conducted on the nonmagnetic kagome metal RbV3Sb5, revealing the spectral characteristics in a broad energy range. The observations indicate the formation of charge-density wave and the significance of electron-phonon coupling.
Article
Materials Science, Multidisciplinary
Bin Shen, Franziska Breitner, Danil Prishchenko, Rudra Sekhar Manna, Anton Jesche, Maximilian L. Seidler, Philipp Gegenwart, Alexander A. Tsirlin
Summary: Magnetization measurements were performed on α-Li2IrO3 under hydrostatic pressures, and the temperature-pressure phase diagram was established. The material undergoes a first-order phase transition from a magnetic phase to a nonmagnetic dimerized phase above 1.2 GPa. The critical pressure of the structural dimerization shows strong temperature dependence.
Article
Chemistry, Inorganic & Nuclear
Manuel Feig, Wilder Carrillo-Cabrera, Matej Bobnar, Paul Simon, Caroline Curfs, Volodymyr Levytskyi, Alexander A. Tsirlin, Andreas Leithe-Jasper, Roman Gumeniuk
Summary: This article investigates the polymorphism and structural relationships of compounds from the Y3+xRh4Ge13-x and Y3+xIr4Ge13-x series. It is found that these compounds are weakly-coupled superconductors with low thermal conductivity and small Seebeck coefficients. Additionally, Y3Rh4Ge13 undergoes a first-order phase transition at 177 K, possibly related to a charge density wave.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Goran J. Nilsen, Corey M. Thompson, Casey Marjerisson, Danis Badrtdinov, Alexander A. Tsirlin, John E. Greedan
Summary: Ba2YReO6 is a double perovskite material where the low-temperature state was previously assumed to be a spin glass, but polarized neutron diffraction experiments revealed that it actually orders with a strongly reduced dipole moment.
Article
Chemistry, Inorganic & Nuclear
Valeriy Yu. Verchenko, Alexander A. Tsirlin, Andrei V. Shevelkov
Summary: Researchers constructed the superconducting Mo4Ga21 structure type starting from the MoGa4 cubic framework and studied the electronic structures of MoGa4, Mo4Ga21, Mo4Ga20Sb, and Mo4Ga20Te. Their findings showed that Mo4Ga20Sb and Mo4Ga20Te superconductors are energetically favorable and are expected to exhibit superconducting properties.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Materials Science, Multidisciplinary
Yoshifumi Tokiwa, Sebastian Bachus, Kavita Kavita, Anton Jesche, Alexander A. Tsirlin, Philipp Gegenwart
Summary: The water-free frustrated magnet KBaYb(BO3)(2) is an ideal refrigerant, with high stability and efficiency. Its magnetic frustration and structural randomness enable cooling to temperatures several times lower than the energy scale of magnetic interactions.
COMMUNICATIONS MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
S. Bachus, D. A. S. Kaib, A. Jesche, V Tsurkan, A. Loidl, S. M. Winter, A. A. Tsirlin, R. Valenti, P. Gegenwart
Summary: The thermodynamics of the Kitaev honeycomb magnet alpha-RuCl3 were studied for different directions of in-plane magnetic field using measurements of the magnetic Gruneisen parameter and specific heat. Two critical fields were identified, with the possibility of inverse melting of the ordered phase in a narrow region of magnetic fields. Large field-induced entropy effects suggest the presence of additional low-energy excitations.
Article
Chemistry, Inorganic & Nuclear
R. A. Khalaniya, A. Sobolev, V. Yu Verchenko, A. A. Tsirlin, A. Senyshyn, F. Damay, I. A. Presniakov, A. Shevelkov
Summary: Fe32+delta Ge33As2 and Fe32+delta'Ge35-xPx are quasi-binary intermetallic compounds with a unique intergrowth-type crystal structure, combining the Co2Al5 and MgFe6Ge6 blocks. They are antiferromagnets with different temperature-dependent magnetic structures.
DALTON TRANSACTIONS
(2021)