Spin gap in a doped Kondo chain

被引：62

作者：

Sikkema, AE

Affleck, I

White, SR

机构：

[1] UNIV BRITISH COLUMBIA,DEPT PHYS & ASTRON,VANCOUVER,BC V6T 1Z1,CANADA

[2] UNIV BRITISH COLUMBIA,CANADIAN INST ADV RES,VANCOUVER,BC V6T 1Z1,CANADA

[3] UNIV CALIF IRVINE,DEPT PHYS & ASTRON,IRVINE,CA 92697

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 05期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.79.929

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the Kondo chain away from half filling has a spin gap upon the introduction of an additional direct Heisenberg coupling between localized spins. This is understood in the weak-Kondo-coupling limit of the Heisenberg-Kondo lattice mode! by bosonization and in the strong-coupling limit by a mapping to a modified t-J model. Only for certain ranges of filling and Heisenberg coupling does the spin gap phase extend from weak to strong coupling.

引用

收藏

页码：929 / 932

页数：4

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