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A model for the Schottky anomaly in metallic Nd2-yCeyCuO4

机译:Nd2-yCeyCuO4金属中肖特基异常的模型

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We present a simple model for the doped compound Nd2-yCevCuO4, in order to explain some recent experimental results on the latter. Within a Hartree-Fock context, we start from an impurity Anderson-like model and consider the magnetic splitting of the Nd-4f ground state Kramers doublet due to exchange interactions with the ordered Cu moments. Our results are in very good agreement with the experimental data, yielding a Schottky anomaly peak for the specific heat that reduces its amplitude, broadens and shifts to lower temperatures, upon Ce doping. For overdoped compounds at low temperatures, the specific heat behaves linearly and the magnetic susceptibility is constant. A smooth transition from this Fermi liquid-like behavior occurs as temperature is increased and, at high temperatures, the susceptibility exhibits a Curie-like behavior. Finally, we discuss some improvements our model is amenable to incorporate, (C) 1998 Elsevier Science B.V. All rights reserved. [References: 17]
机译:我们为掺杂的化合物Nd2-yCevCuO4提供了一个简单的模型,以便解释后者的一些最新实验结果。在Hartree-Fock上下文中,我们从类似安德森的杂质模型开始,并考虑了Nd-4f基态Kramers双重峰的磁性分裂,这是由于与有序Cu矩的相互作用引起的。我们的结果与实验数据非常吻合,在Ce掺杂后,产生了比热的肖特基异常峰,该峰降低了其幅值,变宽并转移至更低的温度。对于低温下的超掺杂化合物,比热呈线性变化,磁化率恒定。随着温度的升高,这种费米液体状行为会平稳过渡,并且在高温下,磁化率表现出居里性质。最后,我们讨论了模型可纳入的一些改进,(C)1998 Elsevier Science B.V.保留所有权利。 [参考:17]

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