1
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Ambika DV, Ding QP, Sebastian SJ, Nath R, Furukawa Y. Static and dynamic magnetic properties of the spin-52triangle lattice antiferromagnet Na 3Fe(PO 4) 2studied by 31P NMR. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 51:015803. [PMID: 36317284 DOI: 10.1088/1361-648x/ac9e37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
31P nuclear magnetic resonance (NMR) measurements have been carried out to investigate the magnetic properties and spin dynamics of Fe3+(S= 5/2) spins in the two-dimensional triangular lattice (TL) compound Na3Fe(PO4)2. The temperature (T) dependence of nuclear spin-lattice relaxation rates (1/T1) shows a clear peak around Néel temperature,TN=10.9K, corresponding to an antiferromagnetic (AFM) transition. From the temperature dependence of NMR shift (K) aboveTN, an exchange coupling between Fe3+spins was estimated to beJ/kB≃1.9K using the spin-5/2 Heisenberg isotropic-TL model. The temperature dependence of1/T1Tdivided by the magnetic susceptibility (χ),1/T1Tχ, aboveTNproves the AFM nature of spin fluctuations below∼50 Kin the paramagnetic state. In the magnetically ordered state belowTN, the characteristic rectangular shape of the NMR spectra is observed, indicative of a commensurate AFM state in its ground state. The strong temperature dependence of 1/T1in the AFM state is well explained by the two-magnon (Raman) process of the spin waves in a 3D antiferromagnet with a spin-anisotropy energy gap of 5.7 K. The temperature dependence of sublattice magnetization is also well reproduced by the spin waves. Those results indicate that the magnetically ordered state of Na3Fe(PO4)2is a conventional 3D AFM state, and no obvious spin frustration effects were detected in its ground state.
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Affiliation(s)
- Devi V Ambika
- Ames National Laboratory, U.S. DOE, Iowa State University, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Qing-Ping Ding
- Ames National Laboratory, U.S. DOE, Iowa State University, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
| | - Sebin J Sebastian
- School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695551, India
| | - Ramesh Nath
- School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695551, India
| | - Yuji Furukawa
- Ames National Laboratory, U.S. DOE, Iowa State University, Ames, IA 50011, United States of America
- Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, United States of America
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2
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Povarov KY, Soldatov TA, Wang RB, Zheludev A, Smirnov AI, Starykh OA. Electron Spin Resonance of the Interacting Spinon Liquid. PHYSICAL REVIEW LETTERS 2022; 128:187202. [PMID: 35594098 DOI: 10.1103/physrevlett.128.187202] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/25/2022] [Indexed: 06/15/2023]
Abstract
We report experimental verification of the recently predicted collective modes of spinons, stabilized by backscattering interaction, in a model quantum spin chain material. We exploit the unique geometry of uniform Dzyaloshinskii-Moriya interactions in K_{2}CuSO_{4}Br_{2} to measure the interaction-induced splitting between the two components of the electron spin resonance (ESR) response doublet. From that we directly determine the magnitude of the "marginally irrelevant" backscattering interaction between spinons for the first time.
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Affiliation(s)
- Kirill Yu Povarov
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - Timofei A Soldatov
- P. L. Kapitza Institute for Physical Problems RAS, 119334 Moscow, Russia
| | - Ren-Bo Wang
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
| | - Andrey Zheludev
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | | | - Oleg A Starykh
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112, USA
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3
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Topological Excitations in Neutral–Ionic Transition Systems. Symmetry (Basel) 2022. [DOI: 10.3390/sym14050925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
The existence and physical properties of topological excitations in ferroelectrics, especially mobile topological boundaries in one dimension, are of profound interest. Notably, topological excitations emerging in association with the neutral–ionic (NI) phase transition are theoretically suggested to carry fractional charges and cause anomalous charge transport. In recent years, we experimentally demonstrated mobile topological excitations in a quasi-one-dimensional (1D) ferroelectric, tetrathiafulvalene-p-chloranil [TTF-CA; TTF (C6H4S4) and CA (C6Cl4O2)], which shows the NI transition, using NMR, NQR, and electrical resistivity measurements. Thermally activated topological excitations carry charges and spins in the NI crossover region and in the ionic phase with a dimer liquid. Moreover, free solitons show a binding transition upon a space-inversion symmetry-breaking ferroelectric order. In this article, we review the recent progress in the study of mobile topological excitations emerging in TTF-CA, along with earlier reports that intensively studied these phenomena, aiming to provide the foundations of the physics of electrical conductivity and magnetism carried by topological excitations in the 1D ferroelectric.
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Otsuka A, Shimizu Y, Saito G, Maesato M, Kiswandhi A, Hiramatsu T, Yoshida Y, Yamochi H, Tsuchiizu M, Nakamura Y, Kishida H, Ito H. Canting Antiferromagnetic Spin-Order ( TN = 102 K) in a Monomer Mott Insulator (ET)Ag 4(CN) 5 with a Diamond Spin-Lattice. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20190279] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Akihiro Otsuka
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yasuhiro Shimizu
- Department of Physics, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Gunzi Saito
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan
- Toyota Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan
| | - Mitsuhiko Maesato
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Andhika Kiswandhi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takaaki Hiramatsu
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan
| | - Yukihiro Yoshida
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, Aichi 468-8502, Japan
| | - Hideki Yamochi
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
- Research Center for Low Temperature and Materials Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | | | - Yuto Nakamura
- Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Hideo Kishida
- Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Hiroshi Ito
- Department of Applied Physics, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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5
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Thakur GS, Reuter H, Felser C, Jansen M. Redetermination of Sr 2PdO 3 from single-crystal X-ray data. Acta Crystallogr E Crystallogr Commun 2019; 75:30-32. [PMID: 30713728 PMCID: PMC6323883 DOI: 10.1107/s2056989018017176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 12/03/2018] [Indexed: 11/10/2022]
Abstract
The crystal structure redetermination of Sr2PdO3 (distrontium palladium trioxide) was carried out using high-quality single-crystal X-ray data. The Sr2PdO3 structure has been described previously in at least three reports [Wasel-Nielen & Hoppe (1970 ▸). Z. Anorg. Allg. Chem. 375, 209-213; Muller & Roy (1971 ▸). Adv. Chem. Ser. 98, 28-38; Nagata et al. (2002 ▸). J. Alloys Compd. 346, 50-56], all based on powder X-ray diffraction data. The current structure refinement of Sr2PdO3, as compared to previous powder data refinements, leads to more precise cell parameters and fractional coordinates, together with anisotropic displacement parameters for all sites. The compound is confirmed to have the ortho-rhom-bic Sr2CuO3 structure type (space group Immm) as reported previously. The structure consists of infinite chains of corner-sharing PdO4 plaquettes inter-spersed by SrII atoms. A brief comparison of Sr2PdO3 with the related K2NiF4 structure type is given.
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Affiliation(s)
- Gohil S. Thakur
- Max Planck Institut for Chemical Physics of Solids, Nöthnitzer Straβe 40, 01187, Dresden, Germany
| | - Hans Reuter
- Institute for Chemistry of New Materials, University of Osnabrück, Barbarastrasse, 7, 49076 Osnabrück, Germany
| | - Claudia Felser
- Max Planck Institut for Chemical Physics of Solids, Nöthnitzer Straβe 40, 01187, Dresden, Germany
| | - Martin Jansen
- Max Planck Institut for Chemical Physics of Solids, Nöthnitzer Straβe 40, 01187, Dresden, Germany
- Max Planck Institut for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
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6
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Sunami K, Nishikawa T, Miyagawa K, Horiuchi S, Kato R, Miyamoto T, Okamoto H, Kanoda K. Evidence for solitonic spin excitations from a charge-lattice-coupled ferroelectric order. SCIENCE ADVANCES 2018; 4:eaau7725. [PMID: 30515457 PMCID: PMC6269158 DOI: 10.1126/sciadv.aau7725] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
Topological defects have been explored in different fields ranging from condensed matter physics and particle physics to cosmology. In condensed matter, strong coupling between charge, spin, and lattice degrees of freedom brings about emergent excitations with topological characteristics at low energies. One-dimensional (1D) systems with degenerate dimerization patterns are typical stages for the generation of topological defects, dubbed "solitons"; for instance, charged solitons are responsible for high electrical conductivity in doped trans-polyacetylene. Here, we provide evidence based on a nuclear magnetic resonance (NMR) study for mobile spin solitons deconfined from a strongly charge-lattice-coupled spin-singlet ferroelectric order in a quasi-1D organic charge-transfer complex. The NMR spectral shift and relaxation rate associated with static and dynamic spin susceptibilities indicate that the ferroelectric order is violated by dilute solitonic spin excitations, which were further demonstrated to move diffusively by the frequency dependence of the relaxation rate. The traveling solitons revealed here may promise the emergence of anomalous electrical and thermal transport.
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Affiliation(s)
- K. Sunami
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - T. Nishikawa
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - K. Miyagawa
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - S. Horiuchi
- Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - R. Kato
- Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - T. Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - H. Okamoto
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of AIST, Chiba 277-8568, Japan
| | - K. Kanoda
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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7
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Fujii Y, Kikuchi H, Nakagawa K, Takada SY, Fujisawa M. 1H-NMR Study of Spin-1/2 Triple-chain Magnet Cu3(OH)4MoO4. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.phpro.2015.12.075] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Hild S, Fukuhara T, Schauß P, Zeiher J, Knap M, Demler E, Bloch I, Gross C. Far-from-equilibrium spin transport in Heisenberg quantum magnets. PHYSICAL REVIEW LETTERS 2014; 113:147205. [PMID: 25325657 DOI: 10.1103/physrevlett.113.147205] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Indexed: 06/04/2023]
Abstract
We study experimentally the far-from-equilibrium dynamics in ferromagnetic Heisenberg quantum magnets realized with ultracold atoms in an optical lattice. After controlled imprinting of a spin spiral pattern with an adjustable wave vector, we measure the decay of the initial spin correlations through single-site resolved detection. On the experimentally accessible time scale of several exchange times, we find a profound dependence of the decay rate on the wave vector. In one-dimensional systems, we observe diffusionlike spin transport with a dimensionless diffusion coefficient of 0.22(1). We show how this behavior emerges from the microscopic properties of the closed quantum system. In contrast to the one-dimensional case, our transport measurements for two-dimensional Heisenberg systems indicate anomalous superdiffusion.
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Affiliation(s)
- Sebastian Hild
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
| | | | - Peter Schauß
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
| | - Johannes Zeiher
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
| | - Michael Knap
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA
| | - Eugene Demler
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
| | - Immanuel Bloch
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany and Ludwig-Maximilians-Universität, Fakultät für Physik, 80799 München, Germany
| | - Christian Gross
- Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
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9
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Maeter H, Zvyagin AA, Luetkens H, Pascua G, Shermadini Z, Saint-Martin R, Revcolevschi A, Hess C, Büchner B, Klauss HH. Low temperature ballistic spin transport in the S = 1/2 antiferromagnetic Heisenberg chain compound SrCuO2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:365601. [PMID: 23924574 DOI: 10.1088/0953-8984/25/36/365601] [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 report zero and longitudinal magnetic field muon spin relaxation (μSR) measurements of the spin S = 1/2 antiferromagnetic Heisenberg chain material SrCuO2. We find that in a weak applied magnetic field B0 the spin-lattice relaxation rate λ follows a power law λ is proportional to B(0)(-n) with n = 0.9(3). This result is temperature independent for 5 K ≤ T ≤ 300 K. Within conformal field theory and using the Müller ansatz we conclude ballistic spin transport in SrCuO2.
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Affiliation(s)
- H Maeter
- Institute for Solid State Physics, TU Dresden, D-01069 Dresden, Germany
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10
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Mastropietro V. Conductivity in the Heisenberg chain with next-to-nearest-neighbor interaction. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 87:042121. [PMID: 23679386 DOI: 10.1103/physreve.87.042121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 03/20/2013] [Indexed: 06/02/2023]
Abstract
We consider a spin chain given by the XXZ model with a weak next-to-nearest-neighbor perturbation that breaks its exact integrability. We prove that such a system has an ideal metallic behavior (infinite conductivity), by rigorously establishing strict lower bounds on the zero-temperature Drude weight, which are strictly positive. The proof is based on exact renormalization group methods allowing us to prove the convergence of the expansions and to fully take into account the irrelevant terms, which play an essential role in ensuring the correct lattice symmetries. We also prove that the Drude weight verifies the same parameter-free relations as in the absence of the integrability-breaking perturbation.
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Affiliation(s)
- Vieri Mastropietro
- University of Milan, Mathematics Department F. Enriquez, Via Saldini 50, Milan, Italy
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11
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Yamamoto T, Kobayashi Y, Okada T, Yagi T, Kawakami T, Tassel C, Kawasaki S, Abe N, Niwa K, Kikegawa T, Hirao N, Takano M, Kageyama H. B1-to-B2 Structural Transitions in Rock Salt Intergrowth Structures. Inorg Chem 2011; 50:11787-94. [DOI: 10.1021/ic201901a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takafumi Yamamoto
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Yoji Kobayashi
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Taku Okada
- Research Institute for Solid
State Physics, University of Tokyo, 5-1-5
Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takehiko Yagi
- Research Institute for Solid
State Physics, University of Tokyo, 5-1-5
Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Takateru Kawakami
- Institute of Quantum Science, Nihon University, Chiyoda, Tokyo 101-8308, Japan
| | - Cédric Tassel
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Shota Kawasaki
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Naoyuki Abe
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
| | - Ken Niwa
- Department of Materials
Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Takumi Kikegawa
- Photon Factory, Institute of
Material Structure Science, High Energy Acceleration Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki
305-0801, Japan
| | - Naohisa Hirao
- Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan
| | - Mikio Takano
- Institute for Integrated Cell-Material
Sciences, Kyoto University, Sakyo, Kyoto
606-8501, Japan
| | - Hiroshi Kageyama
- Department
of Energy
and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8510, Japan
- Institute for Integrated Cell-Material
Sciences, Kyoto University, Sakyo, Kyoto
606-8501, Japan
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12
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Hammerath F, Nishimoto S, Grafe HJ, Wolter AUB, Kataev V, Ribeiro P, Hess C, Drechsler SL, Büchner B. Spin gap in the zigzag spin-1/2 chain cuprate Sr(0.9)Ca(0.1)CuO(2). PHYSICAL REVIEW LETTERS 2011; 107:017203. [PMID: 21797568 DOI: 10.1103/physrevlett.107.017203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2011] [Revised: 05/26/2011] [Indexed: 05/31/2023]
Abstract
We report a comparative study of (63)Cu nuclear magnetic resonance spin lattice relaxation rates T(1)(-1) on undoped SrCuO(2) and Ca-doped Sr(0.9)Ca(0.1)CuO(2) spin chain compounds. A temperature independent T(1)(-1) is observed for SrCuO(2) as expected for an S=1/2 Heisenberg chain. Surprisingly, we observe an exponential decrease of T(1)(-1) for T<90 K in the Ca-doped sample evidencing the opening of a spin gap. The data analysis within the J(1)-J(2) Heisenberg model employing density-matrix renormalization group calculations suggests an impurity driven small alternation of the J(2)-exchange coupling as a possible cause of the spin gap.
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Affiliation(s)
- F Hammerath
- Leibniz Institute for Solid State and Materials Research IFW Dresden, Germany
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13
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Santos LF. Transport control in low-dimensional spin-1/2 Heisenberg systems. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:031125. [PMID: 18851011 DOI: 10.1103/physreve.78.031125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2008] [Indexed: 05/26/2023]
Abstract
We analyze transport of local magnetization and develop schemes to control transport behavior in finite spin-1/2 Heisenberg chains and spin-1/2 Heisenberg two-leg ladders at zero temperature. By adjusting parameters in the Hamiltonians, these quantum systems may show both integrable and chaotic limits. We provide examples of chaotic systems leading to diffusive and to ballistic transport. In addition, methods of coherent quantum control to induce a transition from diffusive to ballistic transport are proposed.
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Affiliation(s)
- Lea F Santos
- Department of Physics, Yeshiva University, 245 Lexington Ave, New York, New York 10016, USA.
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14
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Kordonis K, Sologubenko AV, Lorenz T, Cheong SW, Freimuth A. Spin thermal conductivity of the haldane chain compound Y(2)BaNiO(5). PHYSICAL REVIEW LETTERS 2006; 97:115901. [PMID: 17025905 DOI: 10.1103/physrevlett.97.115901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2006] [Indexed: 05/12/2023]
Abstract
We have measured the thermal conductivity of the spin S=1 chain compound Y(2)BaNiO(5). Analyzing the anisotropy of the thermal transport allows us to identify a definite spin-mediated thermal conductivity kappa(s) along the chain direction. The calculated spin-related energy diffusion constant D(E)(T) shows a broad peak around 120 K. Close to room temperature, D(E)(T) approaches the theoretically predicted high-temperature value, while scattering of spin excitations by magnetic impurities seems to be the major limiting factor of kappa(s) at low temperature.
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Affiliation(s)
- K Kordonis
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
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15
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Pratt FL, Blundell SJ, Lancaster T, Baines C, Takagi S. Low-temperature spin diffusion in a highly ideal S=1/2 Heisenberg antiferromagnetic chain studied by muon spin relaxation. PHYSICAL REVIEW LETTERS 2006; 96:247203. [PMID: 16907276 DOI: 10.1103/physrevlett.96.247203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2006] [Indexed: 05/11/2023]
Abstract
The organic radical-ion salt DEOCC-TCNQF4 contains linear chains of stacked molecules with significant Heisenberg antiferromagnet interactions along the chain and extremely weak interactions between the chains. Zero-field muSR has confirmed the absence of long-range magnetic order down to 20 mK and field-dependent muSR is found to be consistent with diffusive motion of the spin excitations. The anisotropic spin dynamics and the upper boundary for magnetic ordering temperature both indicate interchain magnetic coupling /J'/<7 mK. As the intrachain coupling J is 110 K, /J'/J/ is significantly less than 10(-4). This system therefore provides one of the most ideal examples of the one-dimensional S=1/2 Heisenberg antiferromagnet yet discovered.
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Affiliation(s)
- F L Pratt
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
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16
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Accurate Determination of the Electronic Structure Parameters of the Spin Ladder Compounds SrCu2O3, Sr2Cu3O5 and CaCu2O3. Theor Chem Acc 2006. [DOI: 10.1007/s00214-006-0099-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Sakai K, Klümper A. Non-dissipative thermal transport in the massive regimes of theXXZchain. ACTA ACUST UNITED AC 2003. [DOI: 10.1088/0305-4470/36/46/006] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Magnetized States of Quantum Spin Chains. ACTA ACUST UNITED AC 2002. [DOI: 10.1007/3-540-45649-x_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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19
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Alvarez JV, Gros C. Low-temperature transport in Heisenberg chains. PHYSICAL REVIEW LETTERS 2002; 88:077203. [PMID: 11863934 DOI: 10.1103/physrevlett.88.077203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2001] [Indexed: 05/23/2023]
Abstract
A technique to determine accurately transport properties of integrable and nonintegrable quantum-spin chains at finite temperatures by quantum Monte Carlo is presented. The reduction of the Drude weight by interactions in the integrable gapless regime is evaluated. Evidence for the absence of Drude weight in the gapless regime of a nonintegrable system with longer-ranged interactions is presented. We estimate the effect of the nonintegrability on the transport properties and compare with recent experiments on one-dimensional quantum-spin chains.
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Affiliation(s)
- J V Alvarez
- Fakultät 7, Theoretische Physik, University of the Saarland, 66041 Saarbrücken, Germany
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Thurber KR, Hunt AW, Imai T, Chou FC. 17O NMR study of q = 0 spin excitations in a nearly ideal S = 1 / 2 1D Heisenberg antiferromagnet, Sr2CuO3, up to 800 K. PHYSICAL REVIEW LETTERS 2001; 87:247202. [PMID: 11736538 DOI: 10.1103/physrevlett.87.247202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2001] [Indexed: 05/23/2023]
Abstract
We used 17O NMR to probe the uniform (wave vector q = 0) electron spin excitations up to 800 K in Sr2CuO3 and separate the q = 0 from the q = +/-pi / a staggered components. Our results support the logarithmic decrease of the uniform spin susceptibility below T approximately 0.015J, where J = 2200 K. From measurement of the dynamical spin susceptibility for q = 0 by the spin-lattice relaxation rate 1/T(1), we demonstrate that the q = 0 mode of spin transport is ballistic at the T = 0 limit, but has a diffusion-like contribution at finite temperatures even for T<<J.
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Affiliation(s)
- K R Thurber
- Department of Physics, MIT, Cambridge, Massachusetts 02139 and Center for Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139
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Itoh M, Sugahara M, Yamauchi T, Ueda Y. 63Cu nuclear relaxation in the spin-Peierls compound CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R9631-R9634. [PMID: 9984778 DOI: 10.1103/physrevb.54.r9631] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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