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Low-temperature heat transport in the layered spin-dimer compound Ba_3Mn_2O_8

机译:层状自旋二聚体化合物Ba_3Mn_2O_8中的低温传热

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摘要

We report a study on the low-temperature heat transport of the BaaMn_2O_8 single crystal, a layered spin-dimer compound exhibiting the magnetic-field-induced magnetic order or the magnon Bose-Einstein condensation. The thermal conductivities (k) along both the ab plane and the c axis show nearly isotropic dependence on magnetic field; that is, k 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.
机译:我们报告了BaaMn_2O_8单晶的低温热传输的研究,BaaMn_2O_8单晶是表现出磁场感应的磁序或磁振子玻色-爱因斯坦凝聚的层状自旋二聚体化合物。沿ab平面和c轴的热导率(k)对磁场几乎表现出各向同性。也就是说,k随场的增加而被强烈抑制,特别是在磁性相变的临界场。这些结果表明,磁激发起散射声子的作用,当磁场缩小自旋谱中的缝隙时,散射效应得到增强。此外,这种材料在BEC状态下的磁振子没有显示出显着的传热能力。

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  • 来源
    《Physical review》 |2011年第9期|p.094440.1-094440.6|共6页
  • 作者单位

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

    School of Physical Sciences, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;

    Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China,Hefei, Anhui 230026, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    magnetotransport phenomena; materials for magnetotransport; studies of specific magnetic materials;

    机译:磁传输现象;磁运输材料;特殊磁性材料的研究;

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