Unconventional anomalous Hall effect enhanced by a noncoplanar spin texture in the frustrated Kondo lattice Pr2Ir2O7
Unconventional anomalous Hall effect enhanced by a noncoplanar spin texture in the frustrated Kondo lattice Pr2Ir2O7
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DOI：
10.1103/physrevlett.98.057203
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发表时间：
2007-02-02
影响因子：
8.6
通讯作者：
Onoda, S.
中科院分区：
文献类型：
--
作者：
Machida, Y.;Nakatsuji, S.;Onoda, S.
本文研究了近藤晶格Pr_2Ir_2O_7的霍尔效应。在其类自旋液体顺磁区，霍尔电阻率ρ（xy）随冷却时间的增加而增加。此外，在该低温区域中，霍尔电导率σ（xy）的场依赖性显示出高达30 Ω（-1）cm（-1）的大的增强以及随磁化强度的非单调变化。我们的结果与在普通磁导体中观察到的自旋轨道耦合引起的反常霍尔效应有很大的不同。我们讨论了由于Pr Ising类矩的非共面织构在Ir 5d导带中可能产生的自旋手征效应< 111 >。
We have investigated the Hall effect in the geometrically frustrated Kondo lattice Pr2Ir2O7, In its spin-liquid-like paramagnetic regime, the Hall resistivity rho(xy) is found to increase logarithmically on cooling. Moreover, in this low temperature region, the field dependence of the Hall conductivity sigma(xy) shows a large enhancement up to 30 Omega(-1) cm(-1) as well as a nonmonotonic change with the magnetization. Our results are far different from the anomalous Hall effect due to the spin-orbit coupling observed in ordinary magnetic conductors. We discuss the possible spin-chirality effect in the Ir 5d conduction band due to the noncoplanar texture of Pr < 111 > Ising-like moments.