1
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Povarov KY, Graf DE, Hauspurg A, Zherlitsyn S, Wosnitza J, Sakurai T, Ohta H, Kimura S, Nojiri H, Garlea VO, Zheludev A, Paduan-Filho A, Nicklas M, Zvyagin SA. Pressure-tuned quantum criticality in the large-D antiferromagnet DTN. Nat Commun 2024; 15:2295. [PMID: 38486067 PMCID: PMC10940708 DOI: 10.1038/s41467-024-46527-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 02/29/2024] [Indexed: 03/18/2024] Open
Abstract
Strongly correlated spin systems can be driven to quantum critical points via various routes. In particular, gapped quantum antiferromagnets can undergo phase transitions into a magnetically ordered state with applied pressure or magnetic field, acting as tuning parameters. These transitions are characterized by z = 1 or z = 2 dynamical critical exponents, determined by the linear and quadratic low-energy dispersion of spin excitations, respectively. Employing high-frequency susceptibility and ultrasound techniques, we demonstrate that the tetragonal easy-plane quantum antiferromagnet NiCl2 ⋅ 4SC(NH2)2 (aka DTN) undergoes a spin-gap closure transition at about 4.2 kbar, resulting in a pressure-induced magnetic ordering. The studies are complemented by high-pressure-electron spin-resonance measurements confirming the proposed scenario. Powder neutron diffraction measurements revealed that no lattice distortion occurs at this pressure and the high spin symmetry is preserved, establishing DTN as a perfect platform to investigate z = 1 quantum critical phenomena. The experimental observations are supported by DMRG calculations, allowing us to quantitatively describe the pressure-driven evolution of critical fields and spin-Hamiltonian parameters in DTN.
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Affiliation(s)
- Kirill Yu Povarov
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany.
| | - David E Graf
- National High Magnetic Field Laboratory, Tallahassee, FL, USA
| | - Andreas Hauspurg
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Dresden, Germany
| | - Sergei Zherlitsyn
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
| | - Joachim Wosnitza
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Dresden, Germany
| | - Takahiro Sakurai
- Research Facility Center for Science and Technology, Kobe University, Kobe, Japan
| | - Hitoshi Ohta
- Molecular Photoscience Research Center, Kobe University, Kobe, Japan
- Graduate School of Science, Kobe University, Kobe, Japan
| | - Shojiro Kimura
- Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Sendai, Japan
| | - V Ovidiu Garlea
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | | | - Michael Nicklas
- Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
| | - Sergei A Zvyagin
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany.
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2
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Bai X, Zhang SS, Zhang H, Dun Z, Phelan WA, Garlea VO, Mourigal M, Batista CD. Instabilities of heavy magnons in an anisotropic magnet. Nat Commun 2023; 14:4199. [PMID: 37452016 PMCID: PMC10349074 DOI: 10.1038/s41467-023-39940-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 06/30/2023] [Indexed: 07/18/2023] Open
Abstract
The search for new elementary particles is one of the most basic pursuits in physics, spanning from subatomic physics to quantum materials. Magnons are the ubiquitous elementary quasiparticle to describe the excitations of fully-ordered magnetic systems. But other possibilities exist, including fractional and multipolar excitations. Here, we demonstrate that strong quantum interactions exist between three flavors of elementary quasiparticles in the uniaxial spin-one magnet FeI2. Using neutron scattering in an applied magnetic field, we observe spontaneous decay between conventional and heavy magnons and the recombination of these quasiparticles into a super-heavy bound-state. Akin to other contemporary problems in quantum materials, the microscopic origin for unusual physics in FeI2 is the quasi-flat nature of excitation bands and the presence of Kitaev anisotropic magnetic exchange interactions.
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Affiliation(s)
- Xiaojian Bai
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
- School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
- Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA, 70803, USA.
| | - Shang-Shun Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.
| | - Hao Zhang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Zhiling Dun
- School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - W Adam Phelan
- PARADIM, Department of Chemistry, The Johns Hopkins University, Baltimore, 21218, MD, USA
| | - V Ovidiu Garlea
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Martin Mourigal
- School of Physics, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Cristian D Batista
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
- Neutron Scattering Division and Shull-Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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3
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Karaki MJ, Yang X, Williams AJ, Nawwar M, Doan-Nguyen V, Goldberger JE, Lu YM. An efficient material search for room-temperature topological magnons. SCIENCE ADVANCES 2023; 9:eade7731. [PMID: 36800420 PMCID: PMC9937570 DOI: 10.1126/sciadv.ade7731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Topologically protected magnon surface states are highly desirable as an ideal platform to engineer low-dissipation spintronics devices. However, theoretical prediction of topological magnons in strongly correlated materials proves to be challenging because the ab initio density functional theory calculations fail to reliably predict magnetic interactions in correlated materials. Here, we present a symmetry-based approach, which predicts topological magnons in magnetically ordered crystals, upon applying external perturbations such as magnetic/electric fields and/or mechanical strains. We apply this approach to carry out an efficient search for magnetic materials in the Bilbao Crystallographic Server, where, among 198 compounds with an over 300-K transition temperature, we identify 12 magnetic insulators that support room-temperature topological magnons. They feature Weyl magnons with surface magnon arcs and magnon axion insulators with either chiral surface or hinge magnon modes, offering a route to realize energy-efficient devices based on protected surface magnons.
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Affiliation(s)
- Mohammed J. Karaki
- Department of Physics, The Ohio State University, Columbus, OH 43210, USA
| | - Xu Yang
- Department of Physics, The Ohio State University, Columbus, OH 43210, USA
| | - Archibald J. Williams
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Mohamed Nawwar
- Department of Material Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Vicky Doan-Nguyen
- Department of Material Science and Engineering, The Ohio State University, Columbus, OH 43210, USA
| | - Joshua E. Goldberger
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Yuan-Ming Lu
- Department of Physics, The Ohio State University, Columbus, OH 43210, USA
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4
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Hong T, Ying T, Huang Q, Dissanayake SE, Qiu Y, Turnbull MM, Podlesnyak AA, Wu Y, Cao H, Liu Y, Umehara I, Gouchi J, Uwatoko Y, Matsuda M, Tennant DA, Chern GW, Schmidt KP, Wessel S. Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C 9H 18N 2CuBr 4. Nat Commun 2022; 13:3073. [PMID: 35654798 PMCID: PMC9163114 DOI: 10.1038/s41467-022-30769-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 05/14/2022] [Indexed: 11/12/2022] Open
Abstract
Quantum phase transitions in quantum matter occur at zero temperature between distinct ground states by tuning a nonthermal control parameter. Often, they can be accurately described within the Landau theory of phase transitions, similarly to conventional thermal phase transitions. However, this picture can break down under certain circumstances. Here, we present a comprehensive study of the effect of hydrostatic pressure on the magnetic structure and spin dynamics of the spin-1/2 ladder compound C9H18N2CuBr4. Single-crystal heat capacity and neutron diffraction measurements reveal that the Néel-ordered phase breaks down beyond a critical pressure of Pc ∼ 1.0 GPa through a continuous quantum phase transition. Estimates of the critical exponents suggest that this transition may fall outside the traditional Landau paradigm. The inelastic neutron scattering spectra at 1.3 GPa are characterized by two well-separated gapped modes, including one continuum-like and another resolution-limited excitation in distinct scattering channels, which further indicates an exotic quantum-disordered phase above Pc. There is a class of quantum phase transitions that do not fit into the traditional Landau paradigm, but are described in terms of fractionalized degrees of freedom and emergent gauge fields. Hong et al. find evidence of such a transition in a molecular spin-1/2 antiferromagnetic ladder compound under hydrostatic pressure.
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Affiliation(s)
- Tao Hong
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
| | - Tao Ying
- School of Physics, Harbin Institute of Technology, 150001, Harbin, China
| | - Qing Huang
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA
| | - Sachith E Dissanayake
- Department of Mechanical Engineering, University of Rochester, Rochester, NY, 14617, USA
| | - Yiming Qiu
- National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA
| | - Mark M Turnbull
- Carlson School of Chemistry and Biochemistry, Clark University, Worcester, MA, 01610, USA
| | - Andrey A Podlesnyak
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yan Wu
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Huibo Cao
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Yaohua Liu
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.,Second Target Station, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Izuru Umehara
- Department of Physics, Yokohama National University, Yokohama, 240-8501, Japan
| | - Jun Gouchi
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Yoshiya Uwatoko
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Masaaki Matsuda
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - David A Tennant
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, 37996, USA.,Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Gia-Wei Chern
- Department of Physics, University of Virginia, Charlottesville, VA, 22904, USA
| | - Kai P Schmidt
- Lehrstuhl für Theoretische Physik I, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Staudtstrasse 7, Erlangen, D-91058, Germany
| | - Stefan Wessel
- Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, 52056, Aachen, Germany
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5
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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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6
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Ying T, Schmidt KP, Wessel S. Higgs Mode of Planar Coupled Spin Ladders and its Observation in C_{9}H_{18}N_{2}CuBr_{4}. PHYSICAL REVIEW LETTERS 2019; 122:127201. [PMID: 30978068 DOI: 10.1103/physrevlett.122.127201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Indexed: 06/09/2023]
Abstract
Polarized inelastic neutron scattering experiments recently identified the amplitude (Higgs) mode in C_{9}H_{18}N_{2}CuBr_{4}, a two-dimensional near-quantum-critical spin-1/2 two-leg ladder compound, which exhibits a weak easy-axis exchange anisotropy. Here, we theoretically examine the dynamic spin structure factor of such planar coupled spin-ladder systems using large-scale quantum Monte Carlo simulations. This allows us to provide a quantitative account of the experimental neutron scattering data within a consistent quantum spin model. Moreover, we trace the details of the continuous evolution of the amplitude mode from a two-particle bound state of coupled ladders in the classical Ising limit all the way to the quantum spin-1/2 Heisenberg limit with fully restored SU(2) symmetry, where it gets overdamped by the two-magnon continuum in neutron scattering.
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Affiliation(s)
- T Ying
- Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, 52056 Aachen, Germany
- Department of Physics, Harbin Institute of Technology, 150001 Harbin, China
| | - K P Schmidt
- Institut für Theoretische Physik, FAU Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - S Wessel
- Institut für Theoretische Festkörperphysik, JARA-FIT and JARA-HPC, RWTH Aachen University, 52056 Aachen, Germany
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7
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Xue Z, Ramirez‐Cuesta AJ, Brown CM, Calder S, Cao H, Chakoumakos BC, Daemen LL, Huq A, Kolesnikov AI, Mamontov E, Podlesnyak AA, Wang X. Neutron Instruments for Research in Coordination Chemistry. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801076] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zi‐Ling Xue
- Department of Chemistry University of Tennessee 37996 Knoxville Tennessee United States
| | - Anibal J. Ramirez‐Cuesta
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Craig M. Brown
- Center for Neutron Research National Institute of Standards and Technology 20899 Gaithersburg Maryland United States
- Department of Chemical and Biomolecular Engineering University of Delaware 19716 Newark Delaware United States
| | - Stuart Calder
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Huibo Cao
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Bryan C. Chakoumakos
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Luke L. Daemen
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Ashfia Huq
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Alexander I. Kolesnikov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Eugene Mamontov
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Andrey A. Podlesnyak
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
| | - Xiaoping Wang
- Neutron Scattering Division Oak Ridge National Laboratory 37831 Oak Ridge Tennessee United States
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8
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Awwadi FF, Turnbull MM, Alwahsh MI, Haddad SF. May halogen bonding interactions compete with Cu⋯Cl semi-coordinate bonds? Structural, magnetic and theoretical studies of two polymorphs of trans-bis(5-bromo-2-chloro pyridine)dichlorocopper(ii) and trans-bis(2,5-dichloropyridine)dichlorocopper(ii). NEW J CHEM 2018. [DOI: 10.1039/c8nj00422f] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Interaction of the negative potential area from one molecule with the positive areas I and II from two different molecules produces polymorphs 1 and 2.
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Affiliation(s)
- Firas F. Awwadi
- Department of Chemistry
- The University of Jordan
- Amman 11942
- Jordan
| | - Mark M. Turnbull
- Carlson School of Chemistry and Biochemistry
- Clark University
- Worcester
- USA
| | - Manal I. Alwahsh
- Department of Chemistry
- The University of Jordan
- Amman 11942
- Jordan
| | - Salim F. Haddad
- Department of Chemistry
- The University of Jordan
- Amman 11942
- Jordan
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