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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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Li ZQ, Zhang L, Song Y, Chen XT, Musfeldt JL, Xue ZL. Size-controlled synthesis and magnetic properties of copper germanate nanorods. Observation of size-induced quenching of the spin-Peierls transition. CrystEngComm 2014. [DOI: 10.1039/c3ce41862f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Casola F, Shiroka T, Feiguin A, Wang S, Grbić MS, Horvatić M, Krämer S, Mukhopadhyay S, Conder K, Berthier C, Ott HR, Rønnow HM, Rüegg C, Mesot J. Field-induced quantum soliton lattice in a frustrated two-leg spin-1/2 ladder. PHYSICAL REVIEW LETTERS 2013; 110:187201. [PMID: 23683239 DOI: 10.1103/physrevlett.110.187201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Indexed: 06/02/2023]
Abstract
Based on high-field (31)P nuclear magnetic resonance experiments and accompanying numerical calculations, it is argued that in the frustrated S=1/2 ladder compound BiCu(2)PO(6) a field-induced soliton lattice develops above a critical field of μ(0)H(c1)=20.96(7) T. Solitons result from the fractionalization of the S=1, bosonlike triplet excitations, which in other quantum antiferromagnets are commonly known to experience Bose-Einstein condensation or to crystallize in a superstructure. Unlike in spin-Peierls systems, these field-induced quantum domain walls do not arise from a state with broken translational symmetry and are triggered exclusively by magnetic frustration. Our model predicts yet another second-order phase transition at H(c2)>H(c1), driven by soliton-soliton interactions, most likely corresponding to the one observed in recent magnetocaloric and other bulk measurements.
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Affiliation(s)
- F Casola
- Laboratorium für Festkörperphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland.
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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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Enderle M, Rønnow HM, McMorrow DF, Regnault LP, Dhalenne G, Revcholevschi A, Vorderwisch P, Schneider H, Smeibidl P, Meissner M. Excitations of the field-induced quantum soliton lattice in CuGeO(3). PHYSICAL REVIEW LETTERS 2001; 87:177203. [PMID: 11690306 DOI: 10.1103/physrevlett.87.177203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2000] [Indexed: 05/23/2023]
Abstract
The incommensurate magnetic soliton lattice in the high-field phase of a spin-Peierls system results from quantum fluctuations. We have used neutron scattering techniques to study CuGeO(3), allowing us to obtain the first complete characterization of the excitations of the soliton lattice. Three distinct excitation branches are observed, all of which are gapped. The two highest energy modes have minimum gaps at the commensurate wave vector and correspond to the creation or annihilation of soliton pairs. The third mode is incommensurate and is discussed in relation to theoretical predictions.
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Affiliation(s)
- M Enderle
- Technische Physik, Universität des Saarlandes, 66123 Saarbrücken, Germany
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