Influence of Ce-doping on the magnetic excitations of Nd in Nd2-xCexCuO4

被引：0
|
作者：
Henggeler, W [1 ]
Vorderwisch, P
Chattopadhyay, T
Roessli, B
Furrer, A
机构：
[1] ETH Zurich, Neutron Scattering Lab, CH-5232 Villigen, Switzerland
[2] Hahn Meitner Inst Kernforsch Berlin GmbH, D-14109 Berlin, Germany
[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[4] Max Planck Inst Phys Komplexer Syst, Dresden, Germany
来源：
PHYSICA B | 1997年 / 241卷
关键词：
high-T-c superconductors; magnetic correlations; spin waves;
D O I：
10.1016/S0921-4526(97)00665-0
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present a study of the spin-wave excitations of Nd in Nd2-xCexCuO4(x = 0, 0.09, 0.15, 0.18) by inelastic neutron scattering. Upon Ce-doping one observes a softening of the spin-wave branches. This is mainly explained by the decrease of the Cu-Nd exchange field at the Nd site, while the Nd-Nd exchange interactions remain almost unchanged. Consequently a high density of states of spin-wave excitations at low energies is created. The resulting calculated specific-heat shows a large gamma = C/T-value at low temperatures, which indicates that the novel heavy-fermion behavior in these compounds is mainly due to magnetic correlations of the Nd ions. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：631 / 633
页数：3
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