Multiple magnetic transitions in a frustrated Heavy-Fermion Antiferromagnet YbAgGe under magnetic field and pressure

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The magnetization M and magnetoresistance of a heavy-fermion antiferromagnet YbAgGe have been measured under pressures P up to 2.7 GPa and magnetic fields B up to 9.5 T. This compound crystallizing in the hexagonal ZrNiAl-type structure with a quasi-kagome lattice of Yb ions has two magnetically ordered phases, namely, phase I (T ≤ TM2 = 0:65 K) and phase II (TM2 ≤ T ≤ TM1 = 0:8 K). With increasing pressure to 2.2 GPa, M (B∥a = 9:5 T) at 0.3K increases from 1.5μB/Yb to 1.8μB/Yb, while M (B∥c = 9:5 T) hardly changes. The metamagnetic transition field in M (B∥a) decreases from 4.6 T for P = 0 to 3.3 T for P = 2:2 GPa. As the pressure exceeds P∗ = 1:6 GPa, both TM and the initial slope of M (B∥a) steeply increase and the area of phase I for Bka expands. These observations suggest that the magnetic frustration of the Yb quasi-kagome lattice is partially suppressed by the application of pressure above 1.6 GPa or magnetic field Bka above 4.5 T. Detailed B-T phase diagrams under pressures up to 2.7 GPa are discussed with respect to the magnetic frustration in YbAgGe.

Original languageEnglish
Article number064715
Journaljournal of the physical society of japan
Volume79
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

Keywords

  • Heavy fermion
  • Magnetic frustration
  • Magnetic phase diagram
  • Pressure
  • YbAgGe

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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