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arXiv 1906.07482cond-mat.str-el
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Ce0. 24 La 0.76 Ge化合物中无序驱动的非费米液体行为与磁性的相互作用

Interplay between disorder driven Non-Fermi-liquid behavior and magnetism in Ce0.24La0.76Ge compound

Karan Singh, K. Mukherjee

摘要:

本文研究了Ce_(0.6)La_(0.4)Ge和Ce_(0.24)La_(0.76)Ge化合物的磁性、热容和电输运性质。结果表明,Ce_(0.6)La_(0.4)Ge的两个反铁磁相变(~ 4.7和2.7 K)在低于1.8 K时被Ce_(0.24)La_(0.76)Ge抑制. Ce_(0.24)La_(0.76)Ge的磁化率、热容和电阻率随温度的变化分别为:T_(0.75)、T_(0.5)和T_(1.6)。这种异常的温度变化的观察表明,非费米液体(NFL)的行为,由于无序的4f自旋的存在,由于Ce位稀释。在施加磁场的情况下,注意到从NFL到磁性状态的交叉发生在2特斯拉附近,其中,由于磁矩之间经由传导电子的耦合的主导性,自旋之间的短程相关是普遍的。磁电阻标度表明,无序驱动的NFL态的行为符合自旋玻璃量子临界点的动力学平均场论。

英文摘要:

In this work, we investigate the magnetic, heat capacity and electrical transport properties of Ce0.6La0.4Ge and Ce0.24La0.76Ge compounds. Our results show that two antiferromagnetic transitions (~ at 4.7 and 2.7 K) exhibited by Ce0.6La0.4Ge are suppressed below 1.8 K for Ce0.24La0.76Ge. Interestingly, for Ce0.24La0.76Ge, susceptibility, heat capacity and electrical resistivity vary with temperature as: T0.75, T0.5 and T1.6 respectively. The observation of such anomalous temperature variation suggests to the Non-Fermi-liquid (NFL) behavior due to the presence of disordered 4f spins due to Ce-site dilution. Under the application of magnetic field, it is noted that a crossover from the NFL to a magnetic state occurs around 2 Tesla, where, short-range correlations among the spins is prevalent due to the dominance of coupling between the magnetic moments via conduction electrons. Magnetoresistance scaling indicates that behavior of disorder driven NFL state is described by the dynamical mean field theory of the spin glass quantum critical point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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