Spin Seebeck effect in the polar antiferromagnet α-Cu2V2O7

被引：35
作者：
Shiomi, Y. [1 ,2 ]
Takashima, R. [3 ]
Okuyama, D. [4 ]
Gitgeatpong, G. [5 ,6 ,7 ]
Piyawongwatthana, P. [5 ]
Matan, K. [5 ,6 ]
Sato, T. J. [4 ]
Saitoh, E. [1 ,2 ,8 ,9 ]
机构：
[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Japan Sci & Technol Agcy, ERATO, Spin Quantum Rectificat Project, Aoba Ku, Sendai, Miyagi 9808577, Japan
[3] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan
[4] Tohoku Univ, IMRAM, Sendai, Miyagi 9808577, Japan
[5] Mahidol Univ, Dept Phys, Fac Sci, Bangkok 10400, Thailand
[6] Commiss Higher Educ, ThEP, Bangkok 10400, Thailand
[7] Phranakhon Rajabhat Univ, Fac Sci & Technol, Dept Phys, Bangkok 10220, Thailand
[8] Tohoku Univ, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan
[9] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.96.180414
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have studied the longitudinal spin Seebeck effect in a polar antiferromagnet alpha-Cu2V2O7 in contact with a Pt film. Below the antiferromagnetic transition temperature of alpha-Cu2V2O7, spin Seebeck voltages whose magnetic-field dependence is similar to that reported in antiferromagnetic MnF2 vertical bar Pt bilayers are observed. Though a small weak-ferromagnetic moment appears owing to the Dzyaloshinskii-Moriya interaction in alpha-Cu2V2O7, the magnetic-field dependence of spin Seebeck voltages is found to be irrelevant to the weak-ferromagnetic moments. The dependences of the spin Seebeck voltages on magnetic fields and temperature are analyzed by a magnon spin-current theory. The numerical calculation of spin Seebeck voltages using magnetic parameters of alpha-Cu2V2O7 determined by previous neutron-scattering studies reveals that the magnetic-field and temperature dependences of the spin Seebeck voltages for alpha-Cu2V2O7 vertical bar Pt are governed by the changes in magnon lifetimes with magnetic fields and temperature.
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页数：5
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