Magnetic properties of the half-metallic Heusler alloys Co 2 VAl and Co 2 VGa under pressure

T. Kanomata, Y. Chieda, K. Endo, H. Okada, Makoto Nagasako, K. Kobayashi, Ryosuke Kainuma, Rie Umetsu, H. Takahashi, Y. Furutani, H. Nishihara, Kazutaka Abe, Y. Miura, Masafumi Shirai

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

Magnetization measurements have been carried out at high pressure up to 12.1 kbar for Co 2 VAl and Co 2 VGa with a miniature high-pressure clamp cell. The magnetic moment measured at 5 K is independent of pressure for Co 2 VGa. This is an experimental observation that gives clear evidence that Co 2 VGa possesses half-metallic electronic structure. On the other hand, a sizable pressure dependence of the magnetic moment is observed for Co 2 VAl and it is attributed to the precipitation of the bcc particles in the matrix L 2 1 phase. The Curie temperature decreases with increasing pressure for Co 2 VGa, reflecting characteristics typical for usual itinerant electron systems. The negative pressure dependence of the Curie temperature found in Co 2 VGa contrasts fairly with that of other Heusler alloys containing Mn atoms.

Original languageEnglish
Article number144415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number14
DOIs
Publication statusPublished - 2010 Oct 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Magnetic properties of the half-metallic Heusler alloys Co <sub>2</sub> VAl and Co <sub>2</sub> VGa under pressure'. Together they form a unique fingerprint.

Cite this