Correlations of the Nd magnetic moments and their influence on the specific heat in Nd2-xCexCuO4

被引：20

作者：

Henggeler, W ^{[1
]}

Roessli, B

Furrer, A

Vorderwisch, P

Chatterji, T

机构：

[1] ETH Zurich, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] Hahn Meitner Inst Kernforsch Berlin GmbH, D-14109 Berlin, Germany

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[5] Max Planck Inst Phys Komplexer Syst, Dresden, Germany

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.80.1300

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the effect of Ce substitution on the magnetic excitations of Nd in Nd2-xCexCuO4 by inelastic neutron scattering. A strong softening of the spin waves upon doping is observed, due to a decrease of the Cu-Nd exchange field at the Nd site. Consequently, a high spin-wave density of states is created at low energies, which leads ta giant gamma = C/T values at low temperatures. This demonstrates that the magnetism of the Nd ions is the only source of the large gamma values found in specific-heat experiments, i.e., Nd2-xCexCuO4 has to be excluded as a prototype of a novel heavy-fermion system.

引用

页码：1300 / 1303

页数：4

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