New spin-wave branch induced by the hole doping in La1-xCaxMnO3

被引：3

作者：

Hennion, M ^{[1
]}

Moussa, F

Rodriguez-Carvajal, J

Pinsard, L

Revcolevschi, A

机构：

[1] CEA Saclay, Lab Leon Brillouin, CNRS, CEA, F-91191 Gif Sur Yvette, France

[2] Univ Paris 11, Lab Chim Solides, F-91405 Orsay, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1998年 / 177卷

关键词：

inelastic neutron scattering; giant magnetoresistance; kondo lattice; spin-wave spectrum; anisotropic exchange coupling;

D O I：

10.1016/S0304-8853(97)00619-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Measurements of spin waves in La1-xCaxMnO3, x = 0.08, T = 14 K, are reported and compared to x = 0.05. Two spin-wave branches are observed, one showing the characteristics expected for Mn spins coupled by exchange (strongly anisotropic), the other for hin spins coupled through hole hopping (isotropic, with a quadratic law omega = Dq(2) + Delta at small q). Both spin-wave branches evolve with x. These two types of excitations are separated by an energy band which does not vary with x. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：858 / 859

页数：2

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