Magnetism in doped kondo insulators

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We consider the effect of substitution of small amounts of non-magnetic La for Ce in Kondo insulators of the CeNiSn type. In stoichiometric Kondo insulators, it appears that a gap on the scale of the Kondo temperature TK, is opened in the excitation spectrum. Doping with small amounts of La introduces a dilute heavy-hole gas in which we argue that the hole-hole exchange coupling can lead to an antiferromagnetic ground state at relatively low doping levels. For higher doping levels the system becomes a dirty metal and, depending on the value of the effective conduction-electron-f-electron magnetic coupling JK, may revert to a nonmagnetic state. Thus we anticipate the possibility of a ‘tongue’ of antiferromagnetic phase protruding into the non-magnetic region of the phase diagram at low to intermediate doping levels.

Original languageEnglish
Pages (from-to)1171-1183
Number of pages13
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Volume65
Issue number6
DOIs
Publication statusPublished - Jun 1992

    Fingerprint

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this