Pressure-induced release of magnetic frustration in a quasi-Kagome antiferromagnet YbAgGe

Hirokazu Kubo, Kazunori Umeo, Kenichi Katoh, Akira Ochiai, Toshiro Takabatake

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We report on specific-heat measurements under various pressures up to 3.2 GPa for a heavy-fermion antiferromagnet YbAgGe with a quasi-kagome lattice of Yb ions. For 0.5 < P < P* = 1.6 GPa, the magnetic transition temperature TM remains constant at 0.85 K, while above P* the TM increases linearly with a slope of 0.52 K/GPa. Concomitantly, the specific-heat anomaly at TM converts from a first-order type sharp peak to a second-order type jump. The magnetic entropy at TM rises for P > P*, whereas the Kondo temperature TK does not change, contrary to the behavior expected from the Doniach phase diagram. These findings suggest that the sudden rise of TM(P) for P > P* is not due to the lowering of TK but the release of the magnetic frustration.

Original languageEnglish
Article number023704
Journaljournal of the physical society of japan
Volume77
Issue number2
DOIs
Publication statusPublished - 2008 Feb 1

Keywords

  • Heavy fermion
  • Kondo effect
  • Magnetic frustration
  • Pressure
  • YbAgGe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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