Anomalous magnetic properties near the spin-flop bicritical point in Mn2AS4 (A=Si and Ge)

K. Ohgushi, Y. Ueda

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20 Citations (Scopus)

Abstract

The magnetic properties of the single crystalline Mn2AS4 (A=Si and Ge) with an olivine structure, which are the uniaxially anisotropic antiferromagnets (the b axis as an easy axis), were investigated. Near the Néel temperature, both compounds exhibit the contrastive magnetic responses along the c axis, namely, the spontaneous weak ferromagnetism in A=Si and the significant enhancement of the differential susceptibility (dM/dH) under the small magnetic field in A=Ge. When A=Ge, we also observed the evolution of dM/dH along the a axis at low temperatures. We discuss these phenomena on the basis of the magnetic field-temperature (H-T) phase diagram with the spin-flop bicritical point (HBP,TBP). The role of the thermal or quantum fluctuation was stressed.

Original languageEnglish
Article number217202
JournalPhysical Review Letters
Volume95
Issue number21
DOIs
Publication statusPublished - 2005 Nov 18
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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