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中国物理学会期刊

Eu2-xPbxRu2O7中的金属-绝缘体相变和自旋玻璃态行为

CSTR: 32037.14.aps.55.4912

Metal-insulator transition and spin-glass behavior in Eu2-xPbx Ru2O7 system

CSTR: 32037.14.aps.55.4912
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  • 通过对Eu2-xPbxRu2O7(x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0和1.8)系列样品的结构、电阻和磁化率的观测,结果发现,随着Pb替代浓度x值的增加,样品的电阻率逐渐减小,系统在x=0.8附近发生了金属-绝缘体(M-I)相变;Ru4+的局域磁矩及其自旋玻璃冻结温度TG也随之降低. 在该体系中,Pb2+对Eu3+的部分替代使样品中载流子浓度增加,Pb的6p能带与Ru 4d电子的T2g能带混合,能带得以拓宽,Ru 4d电子的巡游性增强,导致该体系物性的系列变化.

     

    The investigation on the structure, resistivity and susceptibility was carried out for Eu2-xPbxRu2O7 (x=0.0, 0.2, 0.4, 0.6, 0.8, 1.0 and 1.8) samples. It is found that the resistivity of the samples, the local magnetic moment of Ru4+ and the freezing temperature TG of spin glass decrease gradually with the increasing substitution concentration value x of Pb for Eu in Eu2-xPbxRu2O7 system. A metal-insulator (M-I) transition occurs near x=0.8. It is suggested that in this system the partial substitution of Pb2+ for Eu3+ results in the increasing of carrier concentration. And the mixing of 6p band of Pb and the t2g band of Ru 4d electrons brings about an enhancement of itinerary for Ru 4d electrons.

     

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