Collapse of 5f-electron ferromagnetism in UPtAl under high pressures

F. Honda, T. Eto, G. Oomi, A. V. Andreev, V. Sechovský, N. Takeshita, N. Môri

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

UPtAl exhibits a ferromagnetic ordering of U magnetic moments at temperatures below TC = 42.5 K. The magnetic-ordering transition is accompanied by an anomaly in the temperature dependence of electrical resistivity. This allows us to determine the value of Curie temperature from p vs. T data that can be measured at very high pressures, at which reliable magnetization measurements are difficult. We report on resistivity measurements performed on an UPtAl single crystal under hydrostatic pressures p ≤ 8 GPa. It was observed that the initial increase of TC with p becomes gradually reduced for p > 2 GPa until the maximum TC value of ≈48 K is reached between 4 and 6 GPa that is followed by a progressively developing downturn of the TC(p) curve. The latter result is attributed to the approaching collapse of the U 5f-moment ferromagnetism. Low-temperature resistivity data point to a rapidly reduced magnetic anisotropy at highest pressures.

Original languageEnglish
Pages (from-to)159-162
Number of pages4
JournalHigh Pressure Research
Volume22
Issue number1
DOIs
Publication statusPublished - 2002 Apr

Keywords

  • 5f-ligand hybridization
  • Curie temperature
  • Electrical resistivity
  • Ferromagnetism
  • Hydrostatic pressure
  • Uptal

ASJC Scopus subject areas

  • Condensed Matter Physics

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