Low-temperature heat transport of Nd2CuO4: Roles of Nd magnons and spin-structure transitions
Low-temperature heat transport of Nd2CuO4: Roles of Nd magnons and spin-structure transitions
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DOI：
10.1103/physrevb.83.174518
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
Z. Zhao;X. M. Wang;B. Ni;Q. Li;C. Fan;W. Ke;W. Tao;L. Chen;X. Zhao;X. Sun
中科院分区：
文献类型：
--
作者：
Z. Zhao;X. M. Wang;B. Ni;Q. Li;C. Fan;W. Ke;W. Tao;L. Chen;X. Zhao;X. Sun
报道了一种绝缘铜酸盐Nd2CuO4在极低温度(0.3K)下的热导率与磁场的关系。结果表明，除了顺磁矩对声子的散射外，Nd3+磁子既可以作为热载流子，也可以作为声子散射体，这强烈地依赖于长程反铁磁相变和自旋结构的场致相变。特别值得一提的是，Nd^{3+}磁子可以有效地在Nd^{3+}亚晶格的自旋翻转态中传输热。然而，磁振子输运和磁散射在很高的磁场下都被猝灭。面内场下的自旋重定向可以从详细的场依赖关系中推测出来。
We report the magnetic-field dependence of thermal conductivity (\kappa) of an insulating cuprate Nd_2CuO_4 at very low temperatures down to 0.3 K. It is found that apart from the paramagnetic moments scattering on phonons, the Nd^{3+} magnons can act as either heat carriers or phonon scatterers, which strongly depends on the long-range antiferromagnetic transition and the field-induced transitions of spin structure. In particular, the Nd^{3+} magnons can effectively transport heat in the spin-flopped state of the Nd^{3+} sublattice. However, both the magnon transport and the magnetic scattering are quenched at very high fields. The spin re-orientations under the in-plane field can be conjectured from the detailed field dependence of \kappa.