Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice Pr2Ir2O7
Metallic spin-liquid behavior of the geometrically frustrated Kondo lattice Pr2Ir2O7
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DOI：
10.1103/physrevlett.96.087204
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发表时间：
2006-03-03
影响因子：
8.6
通讯作者：
Chan, JY
中科院分区：
文献类型：
--
作者：
Nakatsuji, S;Machida, Y;Chan, JY
通过单晶研究发现了金属焦绿石氧化物Pr_2Ir_2O_7的强阻挫磁性。虽然Pr 4f矩有一个反铁磁RKKY相互作用的能量标度平行T-* 平行=20 K介导的Ir 5d-传导电子，没有发现磁性长程有序，除了在120 mK的部分自旋冻结。相反，近藤效应，包括在电阻率的lnT依赖性，出现，并导致部分屏蔽的时刻低于平行于T-* 平行于。我们的研究结果表明，欠屏蔽的时刻显示自旋液体的行为低于重整化相关标度为1.7 K。
Strongly frustrated magnetism of the metallic pyrochlore oxide Pr2Ir2O7 has been revealed by single crystal study. While Pr 4f moments have an antiferromagnetic RKKY interaction energy scale of parallel to T-*parallel to=20 K mediated by Ir 5d-conduction electrons, no magnetic long-range order is found except for partial spin freezing at 120 mK. Instead, the Kondo effect, including a lnT dependence in the resistivity, emerges and leads to a partial screening of the moments below parallel to T-*parallel to. Our results indicate that the underscreened moments show spin-liquid behavior below a renormalized correlation scale of 1.7 K.