Low-temperature heat transport in the layered spin-dimer compound Ba3Mn2O8

被引：13
作者：
Ke, W. P. [1 ]
Wang, X. M. [1 ]
Fan, C. [1 ]
Zhao, Z. Y. [1 ]
Liu, X. G. [1 ]
Chen, L. M. [2 ]
Li, Q. J. [1 ]
Zhao, X. [3 ]
Sun, X. F. [1 ]
机构：
[1] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[2] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China
[3] Univ Sci & Technol China, Sch Phys Sci, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 09期
基金：
中国国家自然科学基金;
关键词：
THERMAL-CONDUCTIVITY; MAGNETS; SYSTEMS;
D O I：
10.1103/PhysRevB.84.094440
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report a study on the low-temperature heat transport of the Ba3Mn2O8 single crystal, a layered spin-dimer compound exhibiting the magnetic-field-induced magnetic order or the magnon Bose-Einstein condensation. The thermal conductivities (kappa) along both the ab plane and the c axis show nearly isotropic dependence on magnetic field; that is, kappa is strongly suppressed with increasing field, particularly at the critical fields of magnetic phase transitions. These results indicate that the magnetic excitations play a role of scattering phonons and the scattering effect is enhanced when the magnetic field closes the gap in the spin spectrum. In addition, the magnons in the BEC state of this material do not show notable ability of carrying heat.
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页数：6
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