New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb4As3

R. Helfrich, M. Köppen, M. Lang, F. Steglich, A. Ochiai

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34 Citations (Scopus)

Abstract

We report low-temperature specific-heat and thermal-expansion results on the carrier-poor system Yb4As3 as well as Yb4(As1-yXy)3, X: P, Sb. We infer that Yb4As3 behaves as a two-fluid system with almost decoupled spin and charge excitations. Quasi-one-dimensional spin excitations within S = 1/2 Heisenberg chains of Yb3+ ions formed in the charge-ordered state dominate the low-temperature thermodynamic properties. The effect of a magnetic field is to open a (pseudo-)gap in the low-energy spin-excitation spectrum. The Grüneisen parameter shows rather anomalous temperature and field dependences.

Original languageEnglish
Pages (from-to)309-310
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume177-181
Issue numberPART 1
DOIs
Publication statusPublished - 1998 Jan
Externally publishedYes

Keywords

  • Grüneisen parameter
  • Heavy fermions
  • Heisenberg chain
  • Low-carrier-density system
  • Rare earth pnictides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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