Antiferromagnetism and low-temperature specific heat of β-Mn1-xIrx alloys

M. Miyakawa, Rie Umetsu, K. Sasao, K. Fukamichi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The site preference of Ir, the temperature dependence of magnetic susceptibility and the low-temperature specific heat of β-Mn1-xIrx alloys have been investigated. In Mn1-xIrx alloys, the β-phase exists below x = 0.102. From x-ray diffraction patterns, almost all Ir atoms are substituted at site 1 in the β-Mn lattice. The electronic specific heat coefficient γ is proportional to the Néel temperature TN in the form TN 3/4 in regions of low-Ir concentration. With increasing x, however, the gradual decrease in γ leads to a relative increase in γ from the straight line. Therefore, it is concluded that the magnetic state of the β-Mn1-xIrx alloys varies from a weak itinerant-electron antiferromagnet to an intermediate antiferromagnet with increasing Ir concentration. The point to observe is that the γ versus TN 3/4 plots give a universal line for all the β-Mn alloy systems over the entire concentration range.

Original languageEnglish
Pages (from-to)4605-4612
Number of pages8
JournalJournal of Physics Condensed Matter
Volume15
Issue number26
DOIs
Publication statusPublished - 2003 Jul 9

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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