Specific heat and thermal expansion characteristics related to spin fluctuations in antiferromagnetic β-MnOs alloys

M. Miyakawa, R. Y. Umetsu, K. Fukamichi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The temperature dependences of magnetic susceptibility, the specific heat and the thermal expansion of β-Mn1-x Osx alloys have been investigated. The electronic specific heat coefficient γ is significantly large and drastically decreases with increasing x. The specific heat peak associated with the Néel temperature TN is clearly observed in high Os concentration regions. On the other hand, in low Os concentration regions, the peak is not clear and a linear relation between γ and TN3/4 is observed. Therefore, it is concluded that β-Mn1-xOsx alloys with low x are weak itinerant-electron antiferromagnets. The thermal expansion coefficient α in the paramagnetic state is remarkably large in the low Os concentration regions and becomes smaller with increasing x; that is, the larger the electronic specific heat coefficient γ, the larger the value of α in the paramagnetic region.

Original languageEnglish
Pages (from-to)3809-3816
Number of pages8
JournalJournal of Physics Condensed Matter
Volume13
Issue number17
DOIs
Publication statusPublished - 2001 Apr 30

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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