Paramagnetic ground state with field-induced partial order in Nd3Ga5SiO14probed by low-temperature heat transport
Paramagnetic ground state with field-induced partial order in Nd3Ga5SiO14probed by low-temperature heat transport
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DOI：
10.1103/physrevb.85.174438
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发表时间：
2012-05
影响因子：
3.7
通讯作者：
Q. Li;Z. Zhao;H. Zhou;W. Ke;X. M. Wang;C. Fan;X. Liu;L. Chen;X. Zhao;X. Sun
中科院分区：
文献类型：
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作者：
Q. Li;Z. Zhao;H. Zhou;W. Ke;X. M. Wang;C. Fan;X. Liu;L. Chen;X. Zhao;X. Sun
本文研究了自旋液体Nd_3Ga_5SiO_（14）的低温热输运性质，以探讨其基态性质以及磁场对磁性的影响。热导率（\kappa）在零场中表现为纯声子输运。沿c轴的外部磁场沿着诱导\kappa（H）的类似倾角的行为，这可以归因于声子上的简单顺磁散射。然而，磁场沿着ab平面诱导另一个阶梯状减少的\kappa。这种\kappa（H）行为被讨论为与场诱导的偏序有关，它产生低能磁激发，显著散射声子。这些结果表明，磁场沿着ab平面可以诱导部分磁有序的顺磁基态，这也是由低温比热数据表示。
We study the low-temperature heat transport of Nd_3Ga_5SiO_{14}, which is a spin-liquid candidate, to probe the nature of ground state and the effect of magnetic field on the magnetic properties. The thermal conductivity (\kappa) shows a purely phononic transport in zero field. The external magnetic field along the c axis induces a dip-like behavior of \kappa(H), which can be attributed to a simple paramagnetic scattering on phonons. However, the magnetic field along the ab plane induces another step-like decrease of \kappa. This kind of \kappa(H) behavior is discussed to be related to a field-induced partial order, which yields low-energy magnetic excitations that significantly scatter phonons. These results point to a paramagnetic ground state that partial magnetic order can be induced by magnetic field along the ab plane, which is also signified by the low-T specific heat data.