Anomalous nernst effects in pyrochlore molybdates with spin chirality
Anomalous nernst effects in pyrochlore molybdates with spin chirality
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DOI：
10.1103/physrevlett.100.106601
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发表时间：
2008-03-14
影响因子：
8.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Hanasaki, N.;Sano, K.;Tokura, Y.
实验研究了烧绿石型复盐的横向热电（能斯特）效应。在具有自旋手征的Nd_2Mo_2O_7和Sm_2Mo_2O_7中，主要由横向热流（或等效的横向Peltier系数α（xy））产生的能斯特信号显示出低温（20-30 K）正极值，而在（Gd_（0.95）Ca_（0.05））（2）Mo_2O_7中不存在能斯特信号，稀土离子没有单自旋各向异性，因此没有自旋手征。Nd_2 Mo_2 O_7的霍尔电导率σ（xy）和α（xy）之间的相关性也表明自旋手性在自发（反常）能斯特效应中起着重要作用。
The transverse thermoelectric (Nernst) effect on pyrochlore molybdates is investigated experimentally. In Nd2Mo2O7 and Sm2Mo2O7 with the spin chirality, the Nernst signal, which mostly arises from the transverse heat current (or equivalently the transverse Peltier coefficient alpha(xy)), shows a low-temperature (20-30 K) positive extremum, whereas it is absent in (Gd0.95Ca0.05)(2)Mo2O7 with no single-spin anisotropy of the rare-earth ion and hence with no spin chirality. The correlation between the Hall conductivity sigma(xy) and alpha(xy) in Nd2Mo2O7 also indicates the spin chirality plays a significant role in the spontaneous (anomalous) Nernst effect.