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Chen Y, Sato M, Tang Y, Shiomi Y, Oyanagi K, Masuda T, Nambu Y, Fujita M, Saitoh E. Triplon current generation in solids. Nat Commun 2021; 12:5199. [PMID: 34465792 PMCID: PMC8408157 DOI: 10.1038/s41467-021-25494-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 08/04/2021] [Indexed: 11/09/2022] Open
Abstract
A triplon refers to a fictitious particle that carries angular momentum S=1 corresponding to the elementary excitation in a broad class of quantum dimerized spin systems. Such systems without magnetic order have long been studied as a testing ground for quantum properties of spins. Although triplons have been found to play a central role in thermal and magnetic properties in dimerized magnets with singlet correlation, a spin angular momentum flow carried by triplons, a triplon current, has not been detected yet. Here we report spin Seebeck effects induced by a triplon current: triplon spin Seebeck effect, using a spin-Peierls system CuGeO3. The result shows that the heating-driven triplon transport induces spin current whose sign is positive, opposite to the spin-wave cases in magnets. The triplon spin Seebeck effect persists far below the spin-Peierls transition temperature, being consistent with a theoretical calculation for triplon spin Seebeck effects.
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Affiliation(s)
- Yao Chen
- Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Masahiro Sato
- Department of Physics, Ibaraki University, Mito, Ibaraki, Japan.
| | - Yifei Tang
- Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Yuki Shiomi
- Department of Basic Science, The University of Tokyo, Tokyo, Japan
| | - Koichi Oyanagi
- Institute for Materials Research, Tohoku University, Sendai, Japan
- Faculty of Science and Engineering, Iwate University, Morioka, Japan
| | - Takatsugu Masuda
- Institute of Solid State Physics, The University of Tokyo, Kashiwa, Chiba, Japan
| | - Yusuke Nambu
- Institute for Materials Research, Tohoku University, Sendai, Japan
- FOREST, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
- Organization for Advanced Studies, Tohoku University, Sendai, Japan
| | - Masaki Fujita
- Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Eiji Saitoh
- Institute for Materials Research, Tohoku University, Sendai, Japan.
- Department of Applied Physics, The University of Tokyo, Tokyo, Japan.
- Institute for AI and Beyond, The University of Tokyo, Tokyo, Japan.
- Advanced Institute for Materials Research, Tohoku University, Sendai, Japan.
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan.
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Glazkov VN, Skoblin G, Hüvonen D, Yankova TS, Zheludev A. Formation of gapless triplets in the bond-doped spin-gap antiferromagnet (C4H12N2)(Cu2Cl6). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:486002. [PMID: 25388802 DOI: 10.1088/0953-8984/26/48/486002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report results of an electron spin resonance (ESR) study of a spin-gap antiferromagnet (C(4)H(12)N(2))(Cu(2(Cl(6)) (nicknamed PHCC) with chlorine ions partially substituted by bromine. We found that up to 10% of nominal doping the contribution of the random defects to the absorption spectra remains at about 0.1% per copper ion, which is almost the same as in the pure system. Instead, a particular kind of ESR absorption corresponding to gapless S = 1 triplets is observed at low temperatures in samples with high nominal bromine content x ≥ 5%. Increase of bromine concentration also leads to the systematic broadening of ESR absorption line, indicating reduction of the quasi-particles lifetime.
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Clancy JP, Gaulin BD, Adams CP, Granroth GE, Kolesnikov AI, Sherline TE, Chou FC. Singlet-triplet excitations in the unconventional spin-Peierls TiOBr compound. PHYSICAL REVIEW LETTERS 2011; 106:117401. [PMID: 21469893 DOI: 10.1103/physrevlett.106.117401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Indexed: 05/30/2023]
Abstract
We have performed time-of-flight neutron scattering measurements on powder samples of the unconventional spin-Peierls compound TiOBr using the fine-resolution Fermi chopper spectrometer (SEQUOIA) at the Spallation Neutron Source at Oak Ridge National Laboratory. These measurements reveal two branches of magnetic excitations within the commensurate and incommensurate spin-Peierls phases, which we associate with n=1 and n=2 triplet excitations out of the singlet ground state. These results represent the first direct measurement of the singlet-triplet energy gap in TiOBr, which has a value of E(g)=21.2±1.0 meV.
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Affiliation(s)
- J P Clancy
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1, Canada
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Bobroff J, Laflorencie N, Alexander LK, Mahajan AV, Koteswararao B, Mendels P. Impurity-induced magnetic order in low-dimensional spin-gapped materials. PHYSICAL REVIEW LETTERS 2009; 103:047201. [PMID: 19659393 DOI: 10.1103/physrevlett.103.047201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2009] [Revised: 05/29/2009] [Indexed: 05/28/2023]
Abstract
We have studied the effect of nonmagnetic Zn impurities in the coupled spin ladder Bi(Cu_{1-x}Zn_{x})_{2}PO_{6} using ;{31}P NMR, muon spin resonance (microSR), and quantum Monte Carlo simulations. Our results show that the impurities induce in their vicinity antiferromagnetic polarizations, extending over a few unit cells. At low temperature, these extended moments freeze in a process which is found universal among various other spin-gapped compounds: isolated ladders, Haldane, or spin-Peierls chains. This allows us to propose a simple common framework to explain the generic low-temperature impurity-induced freezings observed in low-dimensional spin-gapped materials.
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Affiliation(s)
- J Bobroff
- Laboratoire de Physique des Solides, Université Paris-Sud, UMR-8502 CNRS, 91405 Orsay, France
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Pei LZ, Zhao HS, Tan W, Yu HY, Chen YW, Zhang QF, Fan CG. Low temperature growth and characterizations of single crystalline CuGeO3 nanowires. CrystEngComm 2009. [DOI: 10.1039/b900837n] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Garlea VO, Zheludev A, Regnault LP, Chung JH, Qiu Y, Boehm M, Habicht K, Meissner M. Excitations in a four-leg antiferromagnetic Heisenberg spin tube. PHYSICAL REVIEW LETTERS 2008; 100:037206. [PMID: 18233035 DOI: 10.1103/physrevlett.100.037206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2007] [Indexed: 05/25/2023]
Abstract
Inelastic neutron scattering is used to investigate magnetic excitations in the quasi-one-dimensional quantum spin-liquid system Cu(2)Cl(4).D(8)C(4)SO(2). Contrary to previously conjectured models that relied on bond-alternating nearest-neighbor interactions in the spin chains, the dominant interactions are actually next-nearest-neighbor in-chain antiferromagnetic couplings. The appropriate Heisenberg Hamiltonian is equivalent to that of a S=1/2 4-leg spin-tube with almost perfect one dimensionality and no bond alternation. A partial geometric frustration of rung interactions induces a small incommensurability of short-range spin correlations.
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Affiliation(s)
- V O Garlea
- Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
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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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Kataev V, Choi KY, Grüninger M, Ammerahl U, Büchner B, Freimuth A, Revcolevschi A. Strong anisotropy of superexchange in the copper-oxygen chains of La(14)-xCaxCu24O41. PHYSICAL REVIEW LETTERS 2001; 86:2882-2885. [PMID: 11290063 DOI: 10.1103/physrevlett.86.2882] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2000] [Indexed: 05/23/2023]
Abstract
Electron spin resonance data of Cu2+ ions in La(14)-xCaxCu24O41 single crystals (x = 9,11,12) reveal a very large width of the resonance line in the paramagnetic state. This signals an unusually strong anisotropy of approximately 10% of the isotropic Heisenberg superexchange in the Cu-O chains of this compound. The strong anisotropy can be explained by the specific geometry of two symmetrical 90 degrees Cu-O-Cu bonds, which boosts the importance of orbital degrees of freedom. Our data show the apparent limitations of the applicability of an isotropic Heisenberg model to the low-dimensional cuprates.
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Affiliation(s)
- V Kataev
- II. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany
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Ronnow HM, Enderle M, McMorrow DF, Regnault L, Dhalenne G, Revcolevschi A, Hoser A, Prokes K, Vorderwisch P, Schneider H. Neutron scattering study of the field-induced soliton lattice in CuGeO3. PHYSICAL REVIEW LETTERS 2000; 84:4469-4472. [PMID: 10990713 DOI: 10.1103/physrevlett.84.4469] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/1999] [Indexed: 05/23/2023]
Abstract
CuGeO3 undergoes a transition from a spin-Peierls phase to an incommensurate phase at a critical field of H(c) approximately 12.5 T. In the high-field phase a lattice of solitons forms, with both structural and magnetic components, and these have been studied using neutron scattering techniques. Our results provide direct evidence for a long-ranged magnetic soliton structure which has both staggered and uniform magnetizations with amplitudes that are broadly in accord with theoretical estimates. The magnetic soliton width gamma(m) and the field dependence of the incommensurability deltak(SP) are found to agree well with theoretical predictions.
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Affiliation(s)
- HM Ronnow
- Condensed Matter Physics and Chemistry Department, Riso National Laboratory, DK-4000 Roskilde, Denmark
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Bassi M, Camagni P, Rolli R, Samoggia G, Parmigiani F, Dhalenne G, Revcolevschi A. Optical absorption of CuGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R11030-R11033. [PMID: 9984978 DOI: 10.1103/physrevb.54.r11030] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Uhrig GS, Schulz HJ. Magnetic excitation spectrum of dimerized antiferromagnetic chains. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R9624-R9627. [PMID: 9984776 DOI: 10.1103/physrevb.54.r9624] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kiryukhin V, Keimer B, Hill JP, Coad SM, Paul DM. Synchrotron x-ray-scattering study of magnetic-field-induced transitions in Cu1-x(Zn, Ni)xGeO3. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:7269-7278. [PMID: 9984348 DOI: 10.1103/physrevb.54.7269] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fagot-Revurat Y, Horvatic M, Berthier C, Ségransan P, Dhalenne G, Revcolevschi A. NMR Evidence for a Magnetic Soliton Lattice in the High-Field Phase of CuGeO. PHYSICAL REVIEW LETTERS 1996; 77:1861-1864. [PMID: 10063190 DOI: 10.1103/physrevlett.77.1861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Palme W, Ambert G, Boucher JP, Dhalenne G, Revcolevschi A. Hysteresis in the incommensurate phase of the spin-Peierls compound CuGeO3: Electron spin resonance in high field. PHYSICAL REVIEW LETTERS 1996; 76:4817-4820. [PMID: 10061388 DOI: 10.1103/physrevlett.76.4817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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