Pressure effects on magnetism in U intermetallics: The UPtAl case

V. Sechovský, F. Honda, K. Prokeš, J. C. Griveau, A. V. Andreev, Z. Arnold, J. Kamarád, G. Oomi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The influence of pressure on the formation of U magnetic moments and mediation of exchange interactions are two principal aspects of the complex role of the 5f-ligand hybridization in magnetism of U intermetallics. Application of external pressure yields changes of interatomic distances, which are the crucial parameters controlling the hybridization. We report on pressure experiments with a 5f-electron ferromagnet UPtAl (TC=42.5 K, M s=1.4 μB/f.u. at ambient pressure). Application of hydrostatic pressure up to 1 GPa yields decrease of the spontaneous magnetization Ms with a rate dMs/dp=-0.027 μB/GPa, whereas TC increases (dTC/dp=2.5 K/GPa). Extension of the electrical resistivity measurements of UPtAl to pressures up to 22 GPa reveals that the initial increase of TC with pressure continues up to 6 GPa, where TC reaches the maximum value, and decreases with further increasing pressure. The drastic change of the R(T) curve at 17 GPa is presumably connected with suppression of ferromagnetism in UPtAl.

Original languageEnglish
Pages (from-to)629-632
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume290-291 PART 1
DOIs
Publication statusPublished - 2005 Apr 1
Externally publishedYes

Keywords

  • Curie temperature
  • Electrical resistivity
  • Itinerant 5f-electron ferromagnetism
  • Magnetization
  • Pressure effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Sechovský, V., Honda, F., Prokeš, K., Griveau, J. C., Andreev, A. V., Arnold, Z., Kamarád, J., & Oomi, G. (2005). Pressure effects on magnetism in U intermetallics: The UPtAl case. Journal of Magnetism and Magnetic Materials, 290-291 PART 1, 629-632. https://doi.org/10.1016/j.jmmm.2004.11.317