Pressure dependence of magnetic entropy change and magnetic transition in MnAs1-x Sbx

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Abstract

The pressure dependence of magnetic entropy change, ΔS, of MnAs1-x Sbx has been examined. The peak values of ΔS of MnAs and MnAs0.93 Sb0.07 are slightly increased with increasing pressure below the critical pressure for disappearance of the NiAs-type structure. It has been revealed that MnAs0.93 Sb0.07 undergoes a first-order magnetic transition with and without a structural transformation depending on pressure. The entropy change associated with the structural transformation, Δ Sst, is found to be at most 10% of ΔS in this compound. The origin of small Δ Sst in this system is discussed. The peak value of ΔS of Mn1.03 As0.7 Sb0.3 is gradually decreased with increasing pressure above 2.47 kbar, which is due to broadening of the magnetic transition under high pressure.

Original languageEnglish
Article number092407
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number9
DOIs
Publication statusPublished - Mar 3 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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