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Luo A, Zheng YG, Zhang WY, He MG, Shen YC, Zhu ZH, Yuan ZS, Pan JW. Microscopic Study on Superexchange Dynamics of Composite Spin-1 Bosons. PHYSICAL REVIEW LETTERS 2024; 133:043401. [PMID: 39121402 DOI: 10.1103/physrevlett.133.043401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 05/24/2024] [Accepted: 06/18/2024] [Indexed: 08/11/2024]
Abstract
We report on an experimental simulation of the spin-1 Heisenberg model with composite bosons in a one-dimensional chain based on the two-component Bose-Hubbard model. Exploiting our site- and spin-resolved quantum gas microscope, we observed faster superexchange dynamics of the spin-1 system compared to its spin-1/2 counterpart, which is attributed to the enhancement effect of multi-bosons. We further probed the nonequilibrium spin dynamics driven by the superexchange and single-ion anisotropy terms, unveiling the linear expansion of the spin-spin correlations, which is limited by the Lieb-Robinson bound. Based on the superexchange process, we prepared and verified the entangled qutrits pairs with these composite spin-1 bosons, potentially being applied in qutrit-based quantum information processing.
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Tin P, Jenkins MJ, Xing J, Caci N, Gai Z, Jin R, Wessel S, Krzystek J, Li C, Daemen LL, Cheng Y, Xue ZL. Haldane topological spin-1 chains in a planar metal-organic framework. Nat Commun 2023; 14:5454. [PMID: 37673921 PMCID: PMC10482874 DOI: 10.1038/s41467-023-41014-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 08/18/2023] [Indexed: 09/08/2023] Open
Abstract
Haldane topological materials contain unique antiferromagnetic chains with symmetry-protected energy gaps. Such materials have potential applications in spintronics and future quantum computers. Haldane topological solids typically consist of spin-1 chains embedded in extended three-dimensional (3D) crystal structures. Here, we demonstrate that [Ni(μ-4,4'-bipyridine)(μ-oxalate)]n (NiBO) instead adopts a two-dimensional (2D) metal-organic framework (MOF) structure of Ni2+ spin-1 chains weakly linked by 4,4'-bipyridine. NiBO exhibits Haldane topological properties with a gap between the singlet ground state and the triplet excited state. The latter is split by weak axial and rhombic anisotropies. Several experimental probes, including single-crystal X-ray diffraction, variable-temperature powder neutron diffraction (VT-PND), VT inelastic neutron scattering (VT-INS), DC susceptibility and specific heat measurements, high-field electron spin resonance, and unbiased quantum Monte Carlo simulations, provide a detailed, comprehensive characterization of NiBO. Vibrational (also known as phonon) properties of NiBO have been probed by INS and density-functional theory (DFT) calculations, indicating the absence of phonons near magnetic excitations in NiBO, suppressing spin-phonon coupling. The work here demonstrates that NiBO is indeed a rare 2D-MOF Haldane topological material.
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Affiliation(s)
- Pagnareach Tin
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
| | - Michael J Jenkins
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
| | - Jie Xing
- Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, SC, 29208, USA
| | - Nils Caci
- Institut für Theoretische Festkörperphysik, RWTH Aachen University, 52056, Aachen, Germany
| | - Zheng Gai
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Rongyin Jin
- Center for Experimental Nanoscale Physics, Department of Physics and Astronomy, University of South Carolina, Columbia, SC, 29208, USA
| | - Stefan Wessel
- Institut für Theoretische Festkörperphysik, RWTH Aachen University, 52056, Aachen, Germany
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - Cheng Li
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Luke L Daemen
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Yongqiang Cheng
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.
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3
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Zhang L, Kozhevnikov A, Schulthess T, Trickey SB, Cheng HP. All-electron APW+lo calculation of magnetic molecules with the SIRIUS domain-specific package. J Chem Phys 2023; 158:234801. [PMID: 37326162 DOI: 10.1063/5.0139497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 05/23/2023] [Indexed: 06/17/2023] Open
Abstract
We report APW+lo (augmented plane wave plus local orbital) density functional theory (DFT) calculations of large molecular systems using the domain specific SIRIUS multi-functional DFT package. The APW and FLAPW (full potential linearized APW) task and data parallelism options and the advanced eigen-system solver provided by SIRIUS can be exploited for performance gains in ground state Kohn-Sham calculations on large systems. This approach is distinct from our prior use of SIRIUS as a library backend to another APW+lo or FLAPW code. We benchmark the code and demonstrate performance on several magnetic molecule and metal organic framework systems. We show that the SIRIUS package in itself is capable of handling systems as large as a several hundred atoms in the unit cell without having to make technical choices that result in the loss of accuracy with respect to that needed for the study of magnetic systems.
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Affiliation(s)
- Long Zhang
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
- Center for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, USA
| | | | | | - S B Trickey
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
- Center for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, USA
| | - Hai-Ping Cheng
- Department of Physics, University of Florida, Gainesville, Florida 32611, USA
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
- Center for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, USA
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Wyzula J, Mohelský I, Václavková D, Kapuscinski P, Veis M, Faugeras C, Potemski M, Zhitomirsky ME, Orlita M. High-Angular Momentum Excitations in Collinear Antiferromagnet FePS 3. NANO LETTERS 2022; 22:9741-9747. [PMID: 36458929 DOI: 10.1021/acs.nanolett.2c04111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We report on magneto-optical studies of the quasi-two-dimensional van der Waals antiferromagnet FePS3. Our measurements reveal an excitation that closely resembles the antiferromagnetic resonance mode typical of easy-axis antiferromagnets; nevertheless, it displays an unusual, four-times larger Zeeman splitting in an applied magnetic field. We identify this excitation with an |Sz| = 4 multipolar magnon─a single-ion 4-magnon bound state─that corresponds to a full reversal of a single magnetic moment of the Fe2+ ion. We argue that condensation of multipolar magnons in large-spin materials with a strong magnetic anisotropy can produce new exotic states.
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Affiliation(s)
- Jan Wyzula
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
- Department of Physics, University of Fribourg, Chemin du Musée 3, CH-1700Fribourg, Switzerland
| | - Ivan Mohelský
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
| | - Diana Václavková
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
| | - Piotr Kapuscinski
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
| | - Martin Veis
- Institute of Physics, Charles University, Ke Karlovu 5, Prague, CZ-121 16, Czech Republic
| | - Clément Faugeras
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
| | - Marek Potemski
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
- CENTERA Laboratories, Institute of High Pressure Physics, PAS, PL-01-142Warsaw, Poland
| | - Mike E Zhitomirsky
- Univ. Grenoble Alpes, CEA, IRIG, PHELIQS, 17 avenue des Martyrs, F-38000Grenoble, France
| | - Milan Orlita
- Laboratoire National des Champs Magnétiques Intenses, CNRS UPR3228, EMFL, Univ. Grenoble Alpes, Univ. Toulouse, Univ. Toulouse 3, INSA-T, Grenoble and Toulouse, F-38042, France
- Institute of Physics, Charles University, Ke Karlovu 5, Prague, CZ-121 16, Czech Republic
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5
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Quadrupolar magnetic excitations in an isotropic spin-1 antiferromagnet. Nat Commun 2022; 13:2327. [PMID: 35484168 PMCID: PMC9051120 DOI: 10.1038/s41467-022-30065-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 04/14/2022] [Indexed: 11/08/2022] Open
Abstract
The microscopic origins of emergent behaviours in condensed matter systems are encoded in their excitations. In ordinary magnetic materials, single spin-flips give rise to collective dipolar magnetic excitations called magnons. Likewise, multiple spin-flips can give rise to multipolar magnetic excitations in magnetic materials with spin S ≥ 1. Unfortunately, since most experimental probes are governed by dipolar selection rules, collective multipolar excitations have generally remained elusive. For instance, only dipolar magnetic excitations have been observed in isotropic S = 1 Haldane spin systems. Here, we unveil a hidden quadrupolar constituent of the spin dynamics in antiferromagnetic S = 1 Haldane chain material Y2BaNiO5 using Ni L3-edge resonant inelastic x-ray scattering. Our results demonstrate that pure quadrupolar magnetic excitations can be probed without direct interactions with dipolar excitations or anisotropic perturbations. Originating from on-site double spin-flip processes, the quadrupolar magnetic excitations in Y2BaNiO5 show a remarkable dual nature of collective dispersion. While one component propagates as non-interacting entities, the other behaves as a bound quadrupolar magnetic wave. This result highlights the rich and largely unexplored physics of higher-order magnetic excitations.
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Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet. Nat Commun 2021; 12:5331. [PMID: 34504075 PMCID: PMC8429660 DOI: 10.1038/s41467-021-25591-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 08/18/2021] [Indexed: 11/08/2022] Open
Abstract
An ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba2FeSi2O7 reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode. Anisotropic spin S >1/2 quantum magnets can have multiple low energy modes. In this manuscript, the authors study the interaction of such low energy modes in the S = 1 antiferromagnet Ba2FeSi2O7 by combining neutron scattering measurements with an SU(3) generalization of the 1/S expansion.
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Faure Q, Takayoshi S, Simonet V, Grenier B, Månsson M, White JS, Tucker GS, Rüegg C, Lejay P, Giamarchi T, Petit S. Tomonaga-Luttinger Liquid Spin Dynamics in the Quasi-One-Dimensional Ising-Like Antiferromagnet BaCo_{2}V_{2}O_{8}. PHYSICAL REVIEW LETTERS 2019; 123:027204. [PMID: 31386519 DOI: 10.1103/physrevlett.123.027204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Indexed: 06/10/2023]
Abstract
Combining inelastic neutron scattering and numerical simulations, we study the quasi-one-dimensional Ising anisotropic quantum antiferromagnet BaCo_{2}V_{2}O_{8} in a longitudinal magnetic field. This material shows a quantum phase transition from a Néel ordered phase at zero field to a longitudinal incommensurate spin density wave at a critical magnetic field of 3.8 T. Concomitantly, the excitation gap almost closes and a fundamental reconfiguration of the spin dynamics occurs. These experimental results are well described by the universal Tomonaga-Luttinger liquid theory developed for interacting spinless fermions in one dimension. We especially observe the rise of mainly longitudinal excitations, a hallmark of the unconventional low-field regime in Ising-like quantum antiferromagnetic chains.
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Affiliation(s)
- Quentin Faure
- Université Grenoble Alpes, CEA, IRIG, MEM, MED, F-38000 Grenoble, France
- Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
| | - Shintaro Takayoshi
- Max Planck Institute for the Physics of Complex Systems, Dresden D-01307, Germany
- Department of Quantum Matter Physics, University of Geneva, Geneva CH-1211, Switzerland
| | - Virginie Simonet
- Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
| | - Béatrice Grenier
- Université Grenoble Alpes, CEA, IRIG, MEM, MED, F-38000 Grenoble, France
| | - Martin Månsson
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland
- Department of Applied Physics, KTH Royal Institute of Technology, Kista, Stockholm SE-10044, Sweden
| | - Jonathan S White
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland
| | - Gregory S Tucker
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland
- Laboratory for Quantum Magnetism, Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Christian Rüegg
- Department of Quantum Matter Physics, University of Geneva, Geneva CH-1211, Switzerland
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen PSI CH-5232, Switzerland
- Neutrons and Muons Research Division, Paul Scherrer Institute, Villigen PSI CH-1211, Switzerland
| | - Pascal Lejay
- Université Grenoble Alpes, Institut NEEL, F-38042 Grenoble, France
| | - Thierry Giamarchi
- Department of Quantum Matter Physics, University of Geneva, Geneva CH-1211, Switzerland
| | - Sylvain Petit
- Laboratoire Léon Brillouin, CEA, CNRS, Université Paris-Saclay, CEA-Saclay, Gif-sur-Yvette F-91191, France
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8
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Orlova A, Mayaffre H, Krämer S, Dupont M, Capponi S, Laflorencie N, Paduan-Filho A, Horvatić M. Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields. PHYSICAL REVIEW LETTERS 2018; 121:177202. [PMID: 30411922 DOI: 10.1103/physrevlett.121.177202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Indexed: 06/08/2023]
Abstract
The coupled spin-1 chains material NiCl_{2}-4SC(NH_{2})_{2} (DTN) doped with Br impurities is expected to be a perfect candidate for observing many-body localization at high magnetic field: the so-called "Bose glass," a zero-temperature bosonic fluid, compressible, gapless, incoherent, and short-range correlated. Using nuclear magnetic resonance, we critically address the stability of the Bose glass in doped DTN, and find that it hosts a novel disorder-induced ordered state of matter, where many-body physics leads to an unexpected resurgence of quantum coherence emerging from localized impurity states. An experimental phase diagram of this new "order-from-disorder" phase, established from nuclear magnetic resonance T_{1}^{-1} relaxation rate data in the 13±1% Br-doped DTN, is found to be in excellent agreement with the theoretical prediction from large-scale quantum Monte Carlo simulations.
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Affiliation(s)
- A Orlova
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - H Mayaffre
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - S Krämer
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - M Dupont
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - S Capponi
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - N Laflorencie
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - A Paduan-Filho
- Instituto de Física, Universidade de São Paulo, 05315-970 São Paulo, Brazil
| | - M Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
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9
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Malpetti D, Roscilde T. Auxiliary-Field Monte Carlo Method to Tackle Strong Interactions and Frustration in Lattice Bosons. PHYSICAL REVIEW LETTERS 2017; 119:040602. [PMID: 29341763 DOI: 10.1103/physrevlett.119.040602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Indexed: 06/07/2023]
Abstract
We introduce a new numerical technique, the bosonic auxiliary-field Monte Carlo method, which allows us to calculate the thermal properties of large lattice-boson systems within a systematically improvable semiclassical approach, and which is virtually applicable to any bosonic model. Our method amounts to a decomposition of the lattice into clusters, and to an ansatz for the density matrix of the system in the form of a cluster-separable state-with nonentangled, yet classically correlated clusters. This approximation eliminates any sign problem, and can be systematically improved upon by using clusters of growing size. Extrapolation in the cluster size allows us to reproduce numerically exact results for the superfluid transition of hard-core bosons on the square lattice, and to provide a solid quantitative prediction for the superfluid and chiral transition of hardcore bosons on the frustrated triangular lattice.
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Affiliation(s)
- Daniele Malpetti
- Laboratoire de Physique, CNRS UMR 5672, Ecole Normale Supérieure de Lyon, Université de Lyon, 46 Allée d'Italie, Lyon F-69364, France
| | - Tommaso Roscilde
- Laboratoire de Physique, CNRS UMR 5672, Ecole Normale Supérieure de Lyon, Université de Lyon, 46 Allée d'Italie, Lyon F-69364, France
- Institut Universitaire de France, 103 boulevard Saint-Michel, 75005 Paris, France
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10
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Orlova A, Blinder R, Kermarrec E, Dupont M, Laflorencie N, Capponi S, Mayaffre H, Berthier C, Paduan-Filho A, Horvatić M. Nuclear Magnetic Resonance Reveals Disordered Level-Crossing Physics in the Bose-Glass Regime of the Br-Doped Ni(Cl_{1-x}Br_{x})_{2}-4SC(NH_{2})_{2} Compound at a High Magnetic Field. PHYSICAL REVIEW LETTERS 2017; 118:067203. [PMID: 28234518 DOI: 10.1103/physrevlett.118.067203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Indexed: 06/06/2023]
Abstract
By measuring the nuclear magnetic resonance (NMR) T_{1}^{-1} relaxation rate in the Br (bond) doped DTN compound, Ni(Cl_{1-x}Br_{x})_{2}-4SC(NH_{2})_{2}(DTNX), we show that the low-energy spin dynamics of its high magnetic field "Bose-glass" regime is dominated by a strong peak of spin fluctuations found at the nearly doping-independent position H^{*}≅13.6 T. From its temperature and field dependence, we conclude that this corresponds to a level crossing of the energy levels related to the doping-induced impurity states. Observation of the local NMR signal from the spin adjacent to the doped Br allowed us to fully characterize this impurity state. We have thus quantified a microscopic theoretical model that paves the way to better understanding of the Bose-glass physics in DTNX, as revealed in the related theoretical study [M. Dupont, S. Capponi, and N. Laflorencie, Phys. Rev. Lett. 118, 067204 (2017).PRLTAO0031-900710.1103/PhysRevLett.118.067204].
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Affiliation(s)
- Anna Orlova
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - Rémi Blinder
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - Edwin Kermarrec
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - Maxime Dupont
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Nicolas Laflorencie
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Sylvain Capponi
- Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, 31062 Toulouse, France
| | - Hadrien Mayaffre
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | - Claude Berthier
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
| | | | - Mladen Horvatić
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France
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11
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Wosnitza J, Zvyagin SA, Zherlitsyn S. Frustrated magnets in high magnetic fields-selected examples. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2016; 79:074504. [PMID: 27310818 DOI: 10.1088/0034-4885/79/7/074504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An indispensable parameter to study strongly correlated electron systems is the magnetic field. Application of high magnetic fields allows the investigation, modification and control of different states of matter. Specifically for magnetic materials experimental tools applied in such fields are essential for understanding their fundamental properties. Here, we focus on selected high-field studies of frustrated magnetic materials that have been shown to host a broad range of fascinating new and exotic phases. We will give brief insights into the influence of geometrical frustration on the critical behavior of triangular-lattice antiferromagnets, the accurate determination of exchange constants in the high-field saturated state by use of electron spin resonance measurements, and the coupling of magnetic degrees of freedom to the lattice evidenced by ultrasound experiments. The latter technique as well allowed new, partially metastable phases in strong magnetic fields to be revealed.
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Affiliation(s)
- J Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany. Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany
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12
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Liu J, Goddard PA, Singleton J, Brambleby J, Foronda F, Möller JS, Kohama Y, Ghannadzadeh S, Ardavan A, Blundell SJ, Lancaster T, Xiao F, Williams RC, Pratt FL, Baker PJ, Wierschem K, Lapidus SH, Stone KH, Stephens PW, Bendix J, Woods TJ, Carreiro KE, Tran HE, Villa CJ, Manson JL. Antiferromagnetism in a Family of S = 1 Square Lattice Coordination Polymers NiX2(pyz)2 (X = Cl, Br, I, NCS; pyz = Pyrazine). Inorg Chem 2016; 55:3515-29. [PMID: 27002487 DOI: 10.1021/acs.inorgchem.5b02991] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The crystal structures of NiX2(pyz)2 (X = Cl (1), Br (2), I (3), and NCS (4)) were determined by synchrotron X-ray powder diffraction. All four compounds consist of two-dimensional (2D) square arrays self-assembled from octahedral NiN4X2 units that are bridged by pyz ligands. The 2D layered motifs displayed by 1-4 are relevant to bifluoride-bridged [Ni(HF2)(pyz)2]EF6 (E = P, Sb), which also possess the same 2D layers. In contrast, terminal X ligands occupy axial positions in 1-4 and cause a staggered packing of adjacent layers. Long-range antiferromagnetic (AFM) order occurs below 1.5 (Cl), 1.9 (Br and NCS), and 2.5 K (I) as determined by heat capacity and muon-spin relaxation. The single-ion anisotropy and g factor of 2, 3, and 4 were measured by electron-spin resonance with no evidence for zero-field splitting (ZFS) being observed. The magnetism of 1-4 spans the spectrum from quasi-two-dimensional (2D) to three-dimensional (3D) antiferromagnetism. Nearly identical results and thermodynamic features were obtained for 2 and 4 as shown by pulsed-field magnetization, magnetic susceptibility, as well as their Néel temperatures. Magnetization curves for 2 and 4 calculated by quantum Monte Carlo simulation also show excellent agreement with the pulsed-field data. Compound 3 is characterized as a 3D AFM with the interlayer interaction (J⊥) being slightly stronger than the intralayer interaction along Ni-pyz-Ni segments (J(pyz)) within the two-dimensional [Ni(pyz)2](2+) square planes. Regardless of X, J(pyz) is similar for the four compounds and is roughly 1 K.
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Affiliation(s)
- Junjie Liu
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Paul A Goddard
- Department of Physics, University of Warwick , Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - John Singleton
- National High Magnetic Field Laboratory, Los Alamos National Laboratory , MS-E536, Los Alamos, New Mexico 87545, United States
| | - Jamie Brambleby
- Department of Physics, University of Warwick , Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Francesca Foronda
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Johannes S Möller
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Yoshimitsu Kohama
- National High Magnetic Field Laboratory, Los Alamos National Laboratory , MS-E536, Los Alamos, New Mexico 87545, United States
| | - Saman Ghannadzadeh
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Arzhang Ardavan
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Stephen J Blundell
- Department of Physics, Clarendon Laboratory, University of Oxford , Parks Road, Oxford OX1 3PU, United Kingdom
| | - Tom Lancaster
- Centre for Materials Physics, Durham University , South Road, Durham DH1 3LE, United Kingdom
| | - Fan Xiao
- Centre for Materials Physics, Durham University , South Road, Durham DH1 3LE, United Kingdom
| | - Robert C Williams
- Centre for Materials Physics, Durham University , South Road, Durham DH1 3LE, United Kingdom
| | - Francis L Pratt
- ISIS Pulsed Muon Facility, STFC Rutherford Appleton Laboratory , Chilton, Didcot, OX11 0QX, United Kingdom
| | - Peter J Baker
- ISIS Pulsed Muon Facility, STFC Rutherford Appleton Laboratory , Chilton, Didcot, OX11 0QX, United Kingdom
| | - Keola Wierschem
- School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore
| | - Saul H Lapidus
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , Lemont, Illinois 60439, United States
| | - Kevin H Stone
- Department of Physics and Astronomy, State University of New York , Stony Brook, New York 11794, United States
| | - Peter W Stephens
- Department of Physics and Astronomy, State University of New York , Stony Brook, New York 11794, United States
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen , Copenhagen DK-2100, Denmark
| | - Toby J Woods
- Department of Chemistry and Biochemistry, Eastern Washington University , Cheney, Washington 99004, United States
| | - Kimberly E Carreiro
- Department of Chemistry and Biochemistry, Eastern Washington University , Cheney, Washington 99004, United States
| | - Hope E Tran
- Department of Chemistry and Biochemistry, Eastern Washington University , Cheney, Washington 99004, United States
| | - Cecelia J Villa
- Department of Chemistry and Biochemistry, Eastern Washington University , Cheney, Washington 99004, United States
| | - Jamie L Manson
- Department of Chemistry and Biochemistry, Eastern Washington University , Cheney, Washington 99004, United States
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Vráblová A, Falvello LR, Campo J, Miklovič J, Boča R, Černák J, Tomás M. Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501255] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Anna Vráblová
- Department of Inorganic Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, 04154 Košice, Slovakia, http://www.upjs.sk
| | - Larry R. Falvello
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón (ICMA), University of Zaragoza‐CSIC, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Javier Campo
- Departamento de Física de la Materia Condensada, University of Zaragoza‐CSIC, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Jozef Miklovič
- Department of Chemistry, FPV, University of SS Cyril and Methodius, 91701 Trnava, Slovakia
| | - Roman Boča
- Department of Chemistry, FPV, University of SS Cyril and Methodius, 91701 Trnava, Slovakia
| | - Juraj Černák
- Department of Inorganic Chemistry, P. J. Šafárik University in Košice, Moyzesova 11, 04154 Košice, Slovakia, http://www.upjs.sk
| | - Milagros Tomás
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), University of Zaragoza‐CSIC, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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Zvyagin SA, Kamenskyi D, Ozerov M, Wosnitza J, Ikeda M, Fujita T, Hagiwara M, Smirnov AI, Soldatov TA, Shapiro AY, Krzystek J, Hu R, Ryu H, Petrovic C, Zhitomirsky ME. Direct determination of exchange parameters in Cs2CuBr4 and Cs2CuCl4: high-field electron-spin-resonance studies. PHYSICAL REVIEW LETTERS 2014; 112:077206. [PMID: 24579634 DOI: 10.1103/physrevlett.112.077206] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Indexed: 06/03/2023]
Abstract
Spin-1/2 Heisenberg antiferromagnets Cs2CuCl4 and Cs2CuBr4 with distorted triangular-lattice structures are studied by means of electron spin resonance spectroscopy in magnetic fields up to the saturation field and above. In the magnetically saturated phase, quantum fluctuations are fully suppressed, and the spin dynamics is defined by ordinary magnons. This allows us to accurately describe the magnetic excitation spectra in both materials and, using the harmonic spin-wave theory, to determine their exchange parameters. The viability of the proposed method was proven by applying it to Cs2CuCl4, yielding J/kB=4.7(2) K, J'/kB=1.42(7) K, [J'/J≃0.30] and revealing good agreement with inelastic neutron-scattering results. For the isostructural Cs2CuBr4, we obtain J/kB=14.9(7) K, J'/kB=6.1(3) K, [J'/J≃0.41], providing exact and conclusive information on the exchange couplings in this frustrated spin system.
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Affiliation(s)
- S A Zvyagin
- Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - D Kamenskyi
- Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - M Ozerov
- Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - J Wosnitza
- Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany and Institüt fur Festkörperphysik, TU Dresden, 01068 Dresden, Germany
| | - M Ikeda
- KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - T Fujita
- KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - M Hagiwara
- KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - A I Smirnov
- P.L. Kapitza Institute for Physical Problems, RAS, 119334 Moscow, Russia
| | - T A Soldatov
- Moscow Institute for Physics and Technology, 141700 Dolgoprudnyi, Russia
| | - A Ya Shapiro
- A.V. Shubnikov Institute of Crystallography, RAS, 119333, Moscow, Russia
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - R Hu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - H Ryu
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA and Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
| | - C Petrovic
- Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA and Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
| | - M E Zhitomirsky
- Service de Physique Statistique, Magnétisme et Supraconductivité, UMR-E9001 CEA-INAC/UJF, 38054 Grenoble Cedex 9, France
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15
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Cao G, Qi TF, Li L, Terzic J, Yuan SJ, DeLong LE, Murthy G, Kaul RK. Novel magnetism of Ir5+(5d4) Ions in the double perovskite Sr2YIrO6. PHYSICAL REVIEW LETTERS 2014; 112:056402. [PMID: 24580616 DOI: 10.1103/physrevlett.112.056402] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Indexed: 06/03/2023]
Abstract
We synthesize and study single crystals of a new double-perovskite Sr2YIrO6. Despite two strongly unfavorable conditions for magnetic order, namely, pentavalent Ir5+(5d4) ions which are anticipated to have Jeff=0 singlet ground states in the strong spin-orbit coupling (SOC) limit and geometric frustration in a face-centered cubic structure formed by the Ir5+ ions, we observe this iridate to undergo a novel magnetic transition at temperatures below 1.3 K. We provide compelling experimental and theoretical evidence that the origin of magnetism is in an unusual interplay between strong noncubic crystal fields, local exchange interactions, and "intermediate-strength" SOC. Sr2YIrO6 provides a rare example of the failed dominance of SOC in the iridates.
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Affiliation(s)
- G Cao
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - T F Qi
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - L Li
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - J Terzic
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - S J Yuan
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA and Department of Physics, Shanghai University, Shanghai, China
| | - L E DeLong
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - G Murthy
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
| | - R K Kaul
- Department of Physics and Astronomy and Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA
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16
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Tsyrulin N, Batista CD, Zapf VS, Jaime M, Hansen BR, Niedermayer C, Rule KC, Habicht K, Prokes K, Kiefer K, Ressouche E, Paduan-Filho A, Kenzelmann M. Neutron study of the magnetism in NiCl2·4SC(NH2)2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:216008. [PMID: 23649209 DOI: 10.1088/0953-8984/25/21/216008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We study the strongly anisotropic quasi-one-dimensional S = 1 quantum magnet NiCl2·4SC(NH2)2 using elastic and inelastic neutron scattering. We demonstrate that a magnetic field splits the excited doublet state and drives the lower doublet state to zero energy at a critical field Hc1. For Hc1 < H < Hc2, where Hc2 indicates the transition to a fully magnetized state, three-dimensional magnetic order is established with the AF moment perpendicular to the magnetic field. We mapped the temperature/magnetic field phase diagram, and we find that the total ordered magnetic moment reaches m(tot) = 2.1 μB at the field μ(0)H = 6 T and is thus close to the saturation value of the fully ordered moment. We study the magnetic spin dynamics in the fully magnetized state for H > Hc2, and we demonstrate the presence of an AF interaction between Ni(2+) on the two interpenetrating sublattices. In the antiferromagnetically ordered phase, the spin-waves that develop from the lower-energy doublet are split into two modes. This is most likely the result of the presence of the AF interaction between the interpenetrating lattices.
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Affiliation(s)
- N Tsyrulin
- Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
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17
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Mukhopadhyay S, Klanjšek M, Grbić MS, Blinder R, Mayaffre H, Berthier C, Horvatić M, Continentino MA, Paduan-Filho A, Chiari B, Piovesana O. Quantum-critical spin dynamics in quasi-one-dimensional antiferromagnets. PHYSICAL REVIEW LETTERS 2012; 109:177206. [PMID: 23215221 DOI: 10.1103/physrevlett.109.177206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Indexed: 06/01/2023]
Abstract
By means of nuclear spin-lattice relaxation rate T(1)(-1), we follow the spin dynamics as a function of the applied magnetic field in two gapped quasi-one-dimensional quantum antiferromagnets: the anisotropic spin-chain system NiCl(2)-4SC(NH(2))(2) and the spin-ladder system (C(5)H(12)N)(2)CuBr(4). In both systems, spin excitations are confirmed to evolve from magnons in the gapped state to spinons in the gapless Tomonaga-Luttinger-liquid state. In between, T(1)(-1) exhibits a pronounced, continuous variation, which is shown to scale in accordance with quantum criticality. We extract the critical exponent for T(1)(-1), compare it to the theory, and show that this behavior is identical in both studied systems, thus demonstrating the universality of quantum-critical behavior.
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Affiliation(s)
- S Mukhopadhyay
- Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS and INSA, BP 166, 38042 Grenoble Cedex 9, France
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18
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Yu R, Yin L, Sullivan NS, Xia JS, Huan C, Paduan-Filho A, Oliveira Jr NF, Haas S, Steppke A, Miclea CF, Weickert F, Movshovich R, Mun ED, Scott BL, Zapf VS, Roscilde T. Bose glass and Mott glass of quasiparticles in a doped quantum magnet. Nature 2012; 489:379-84. [DOI: 10.1038/nature11406] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 07/11/2012] [Indexed: 11/09/2022]
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19
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Sizanov AV, Syromyatnikov AV. Antiferromagnet with two coupled antiferromagnetic sublattices in a magnetic field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:146002. [PMID: 21427479 DOI: 10.1088/0953-8984/23/14/146002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We discuss the magnon spectrum of an antiferromagnet (AF) in a magnetic field h consisting of two interpenetrating AF sublattices coupled by the exchange interaction at T = 0. One-ion easy-plane anisotropy is also taken into account. We calculate using the 1/S expansion the gap in the spectrum which is a manifestation of the order-by-disorder effect in this system and the optical magnon mode splitting. Both of these phenomena originate from the inter-sublattice interaction. We also calculate the gap value at h≈h(c) in the leading order of the small parameter (h(c) - h)/h(c) using the magnon Bose-Einstein condensation treatment, where h(c) is the saturation field. By comparing results obtained within these two approaches we conclude that the 1/S expansion gives a qualitatively correct result at h ~ h(c) even at large one-ion anisotropy but it overestimates the gap value. The application is discussed of these results to the actively studied AF of the considered type NiCl₂-4SC(NH₂)₂(DTN).
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Affiliation(s)
- A V Sizanov
- Petersburg Nuclear Physics Institute, Gatchina, St Petersburg, Russia.
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20
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Kohama Y, Sologubenko AV, Dilley NR, Zapf VS, Jaime M, Mydosh JA, Paduan-Filho A, Al-Hassanieh KA, Sengupta P, Gangadharaiah S, Chernyshev AL, Batista CD. Thermal transport and strong mass renormalization in NiCl2-4SC(NH2)2. PHYSICAL REVIEW LETTERS 2011; 106:037203. [PMID: 21405291 DOI: 10.1103/physrevlett.106.037203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 12/02/2010] [Indexed: 05/30/2023]
Abstract
Several quantum paramagnets exhibit magnetic-field-induced quantum phase transitions to an antiferromagnetic state that exists for H c1 ≤ H ≤ H c2. For some of these compounds, there is a significant asymmetry between the low- and high-field transitions. We present specific heat and thermal conductivity measurements in NiCl2-4SC(NH2)2, together with calculations which show that the asymmetry is caused by a strong mass renormalization due to quantum fluctuations for H ≤ H c1 that are absent for H ≥ H c2. We argue that the enigmatic lack of asymmetry in thermal conductivity is due to a concomitant renormalization of the impurity scattering.
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Affiliation(s)
- Y Kohama
- MPA-CMMS, LANL, Los Alamos, New Mexico 87545, USA
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21
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Zvyagin SA, Ozerov M, Cizmár E, Kamenskyi D, Zherlitsyn S, Herrmannsdörfer T, Wosnitza J, Wünsch R, Seidel W. Terahertz-range free-electron laser electron spin resonance spectroscopy: techniques and applications in high magnetic fields. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2009; 80:073102. [PMID: 19655938 DOI: 10.1063/1.3155509] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The successful use of picosecond-pulse free-electron-laser (FEL) radiation for the continuous-wave terahertz-range electron spin resonance (ESR) spectroscopy has been demonstrated. The combination of two linac-based FELs (covering the wavelength range of 4-250 microm) with pulsed magnetic fields up to 70 T allows for multifrequency ESR spectroscopy in a frequency range of 1.2-75 THz with a spectral resolution better than 1%. The performance of the spectrometer is illustrated with ESR spectra obtained in the 2,2-diphenyl-1-picrylhydrazyl and the low-dimensional organic material (C6H9N2)CuCl3.
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Affiliation(s)
- S A Zvyagin
- Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf (FZD), 01314 Dresden, Germany.
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22
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Sun XF, Tao W, Wang XM, Fan C. Low-temperature heat transport in the low-dimensional quantum magnet NiCl2-4SC(NH2)2. PHYSICAL REVIEW LETTERS 2009; 102:167202. [PMID: 19518749 DOI: 10.1103/physrevlett.102.167202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 02/07/2009] [Indexed: 05/27/2023]
Abstract
We report a study of the low-temperature thermal conductivity of NiCl2-4SC(NH2)_{2}, which is a spin-1 chain system exhibiting the magnon Bose-Einstein condensation (BEC) in a magnetic field. It is found that the low-T thermal conductivity along the spin-chain direction shows strong anomalies at the lower and upper critical fields of the magnon BEC state. In this state, magnons act mainly as phonon scatterers at relatively high temperature, but change their role to heat carriers upon temperature approaching zero. The result demonstrates a large thermal conductivity in the magnon BEC state and points to a direct analog between the magnon BEC and the conventional one.
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Affiliation(s)
- X F Sun
- Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
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Paduan-Filho A, Al-Hassanieh KA, Sengupta P, Jaime M. Critical properties at the field-induced Bose-Einstein condensation in NiCl(2)-4SC(NH2)2. PHYSICAL REVIEW LETTERS 2009; 102:077204. [PMID: 19257711 DOI: 10.1103/physrevlett.102.077204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Indexed: 05/27/2023]
Abstract
We report new magnetization measurements on the spin-gap compound NiCl(2)-4SC(NH2)2 at the low-field boundary of the magnetic field-induced ordering. The critical density of the magnetization is analyzed in terms of a Bose-Einstein condensation of bosonic quasiparticles. The analysis of the magnetization at the transition leads to the conclusion for the preservation of the U(1) symmetry, as required for Bose-Einstein condensation. The experimental data are well described by quantum Monte Carlo simulations.
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Affiliation(s)
- A Paduan-Filho
- Instituto de Física, Universidade de São Paulo, 05315-970 SP, Brazil
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Yin L, Xia JS, Zapf VS, Sullivan NS, Paduan-Filho A. Direct measurement of the Bose-Einstein condensation universality class in NiCl2-4SC(NH2)2 at ultralow temperatures. PHYSICAL REVIEW LETTERS 2008; 101:187205. [PMID: 18999861 DOI: 10.1103/physrevlett.101.187205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2008] [Revised: 09/05/2008] [Indexed: 05/27/2023]
Abstract
In this work, we demonstrate field-induced Bose-Einstein condensation (BEC) in the organic compound NiCl2-4SC(NH2)_{2} using ac susceptibility measurements down to 1 mK. The Ni S=1 spins exhibit 3D XY antiferromagnetism between a lower critical field H_{c1} approximately 2 T and a upper critical field H_{c2} approximately 12 T. The results show a power-law temperature dependence of the phase transition line H_{c1}(T)-H_{c1}(0)=aT;{alpha} with alpha=1.47+/-0.10 and H_{c1}(0)=2.053 T, consistent with the 3D BEC universality class. Near H_{c2}, a kink was found in the phase boundary at approximately 150 mK.
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Affiliation(s)
- L Yin
- Department of Physics, University of Florida, and National High Magnetic Field Laboratory, Gainesville, Florida 32611-8440, USA
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25
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Cox S, McDonald RD, Armanious M, Sengupta P, Paduan-Filho A. Unusual magneto-optical phenomenon reveals low energy spin dispersion in the spin-1 anisotropic Heisenberg antiferromagnetic chain system NiCl2-4SC(NH2)_{2}. PHYSICAL REVIEW LETTERS 2008; 101:087602. [PMID: 18764662 DOI: 10.1103/physrevlett.101.087602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2008] [Indexed: 05/26/2023]
Abstract
Electron paramagnetic resonance measurements of NiCl2-4SC(NH2)_{2} reveal the low-energy spin dispersion, including a magnetic-field interval in which the two-magnon continuum is within k_{B}T of the ground state, allowing a continuum of excitations over a range of k states, rather than only the k=0 single-magnon excitations. This produces a novel Y shape in the frequency-field EPR spectrum measured at T > or = 1.5 K. Since the interchain coupling J_{ perpendicular}<<k_{B}T, this shape can be reproduced by a single S=1 antiferromagnetic Heisenberg chain with a strong easy-plane single-ion anisotropy. Importantly, the combination of experiment and modeling we report herein demonstrates a powerful approach to probing spin dispersion in a wide range of interacting magnetic systems without the stringent sample requirements and complications associated with inelastic scattering experiments.
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Affiliation(s)
- S Cox
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS-E536, Los Alamos, New Mexico 87545, USA
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Lorenz T, Heyer O, Garst M, Anfuso F, Rosch A, Rüegg C, Krämer K. Diverging thermal expansion of the spin-ladder system (C5H12N)2CuBr4. PHYSICAL REVIEW LETTERS 2008; 100:067208. [PMID: 18352512 DOI: 10.1103/physrevlett.100.067208] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Indexed: 05/26/2023]
Abstract
We present high-resolution measurements of the c(*)-axis thermal expansion and magnetostriction of piperidinium copper bromide (C5H12N)2CuBr4. The experimental data at low temperatures are well accounted for by a two-leg spin-ladder Hamiltonian. The thermal expansion shows a complex behavior with various sign changes and approaches a 1/square root T divergence at the critical fields. All low-temperature features are semiquantitatively explained within a free-fermion model; full quantitative agreement is obtained with quantum Monte Carlo simulations.
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Affiliation(s)
- T Lorenz
- II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.
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Li L, Turnbull MM, Landee CP, Jornet J, Deumal M, Novoa JJ, Wikaira JL. Synthesis, Structure, and Magnetic Behavior of Bis(2-amino-5-fluoropyridinium) Tetrachlorocuprate(II). Inorg Chem 2007; 46:11254-65. [DOI: 10.1021/ic701645y] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Christopher P. Landee
- Department of Physics, Clark University, 950 Main Street, Worcester, Massachusetts 01610
| | | | | | | | - Jan L. Wikaira
- Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
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