Magnetic entropy changes of SmMn2Ge2 under high pressure

Keiichi Koyama, Shihou Miura, Hironari Okada, Toru Shigeoka, Kazuo Watanabe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In order to obtain the information about magnetic states of reentrant ferromagnet, SmMn2Ge2, we have studied the pressure effect on magnetocaloric properties by magnetization measurements under high pressures up to 1.2 GPa in the temperature range from 5 to 300 K. Using the Maxwell relation, we estimated the magnetic entropy change |ΔSM| to be 0.65 JK-1mol-1 at T1 (= 100K) and 0.53 JK -1mol-1 at T2 (= 150K) under 0.1 MPa. By applying pressures up to 0.5 GPa, |ΔSM(T1)| is enhanced (2.0 JK-1 mol-1), while |ΔS M(T2)| is slightly suppressed (0.4 JK-1 mol-1). The obtained values of |ΔSM| were discussed on the basis of a mean field theory using a two-sublattice model.

Original languageEnglish
Pages (from-to)451-454
Number of pages4
JournalMaterials Transactions
Volume48
Issue number3
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • High pressure
  • Magnetic entropy
  • Magnetic phase transition
  • Magnetocaloric effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Koyama, K., Miura, S., Okada, H., Shigeoka, T., & Watanabe, K. (2007). Magnetic entropy changes of SmMn2Ge2 under high pressure. Materials Transactions, 48(3), 451-454. https://doi.org/10.2320/matertrans.48.451