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10. Magnetostructural Correlations in Nitrogen-Deficient Antiperovskite Mn3CuN1-\delta

Author

Takenaka, Koshi, Shibayama, Takashi, Asano, Kazuko, and Koyama, Keiichi

Abstract

Ferromagnetic shape memory effects of antiperovskite Mn3CuN are markedly altered by nitrogen deficiency. The martensitic transformation occurs at a lower temperature than ferromagnetic ordering for nitrogen-deficient Mn3CuN0.8, although they both occur simultaneously for stoichiometric Mn3CuN. In the martensitic phase, Mn3CuN0.8contracts in a direction parallel to the magnetic field, in contrast to the expansion observed in Mn3CuN, implying that the easy axis is converted from the longer $a$ axis in Mn3CuN to the shorter $c$ axis in Mn3CuN0.8. The operating magnetic field for magnetostriction drastically decreases for Mn3CuN0.8, suggesting a possible supermagnetostriction around the critical compositional region for the easy-axis conversion.

Published
2010
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