Magnetic correlations reflected by anomalies in transport and elastic properties of uranium intermetallics

V. Sechovský, F. Honda, B. Janoušová, K. Prokeš, P. Svoboda, O. Syshchenko, A. V. Andreev

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

We discuss anomalies in temperature dependences of the electrical resistivity ρ(T) and thermal-expansion ΔL/L(T) observed for UTX compounds (T = transition metal, X = p-electron element) in paramagnetic range. We shall concentrate on the antiferromagnets UNiAl and UNiGa and the itinerant 5f-electron metamagnet UCoAl. The ρ(T) and ΔL/L(T) anomalies are usually strongly anisotropic and survive far above the Néel temperature or a characteristic temperature T* (UCoAl) but can be removed in a high magnetic field applied along the easy-magnetization direction (c-axis). In some cases, the available specific-heat data allow to calculate the entropy change ΔS connected with applying a high magnetic field along the c-axis. The ΔS values also show a maximum above TN (UNiAl, UNiGa) or T* (UCoAl) and then slowly decay with increasing temperatures. A possible scenario for these phenomena presented here, is based on existence of antiferromagnetic (AF) correlations and/or short-range AF ordering surviving in paramagnetic range.

Original languageEnglish
Pages (from-to)95-99
Number of pages5
JournalPhysica B: Condensed Matter
Volume328
Issue number1-2
DOIs
Publication statusPublished - 2003 Apr 1
Externally publishedYes
EventT2PAM - Higashi-Hiroshima, Japan
Duration: 2002 Aug 162002 Aug 19

Keywords

  • Antiferromagnetic correlations
  • Electrical resistivity
  • Entropy changes
  • Short range antiferromagnetic order
  • Thermal expansion
  • UTX compounds

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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