Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl

N. Kimura, N. Kabeya, H. Aoki, K. Ohyama, M. Maeda, H. Fujii, M. Kogure, T. Asai, T. Komatsubara, T. Yamamura, I. Satoh

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We present the temperature-pressure-magnetic-field phase diagram of the itinerant-electron metamagnet UCoAl determined from the ac susceptibility measurement. The quantum critical point (QCP) was found to be located at 2.9±0.2 GPa (≡PQCP) and 130±5 kOe. In addition to the determination of the phase diagram, we report magnetic and transport properties in the paramagnetic state and around the phase boundary. The critical divergence of the magnetic susceptibility is suppressed toward the QCP. From the longitudinal magnetoresistance and the resistivity under magnetic fields, enhancement of the resistivity is observed in the so-called supercritical region. In the paramagnetic region, the magnetoresistance and temperature dependence of the resistivity exhibit complex behaviors, especially in the vicinity of 1.5 GPa and PQCP.

Original languageEnglish
Article number035106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number3
DOIs
Publication statusPublished - 2015 Jul 2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl'. Together they form a unique fingerprint.

Cite this