We verified the intimate relation between magnetism and volume in Mn 3 ZnN. The sample sintered at 900 °C is characterized by the Γ 5g triangular antiferromagnetic (AF) state with larger volume below 170 K. However, for the sample sintered at 700 °C, the re-entrant phase transition appears at 80 K and the ground state is a different AF state with smaller volume. These results indicate that the ground state of Mn 3 ZnN is sensitive to the disorder in the N site and that the magnetic structure drastically alters magnetovolume effects. More detailed consideration is necessary beyond the conventional scheme, which incorporates only the amplitude of the magnetic moment.
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Phase instability of magnetic ground state in antiperovskite Mn 3 ZnN: Giant magnetovolume effects related to magnetic structure
Hamada, T.; Takenaka, K.
Follow Journal of Applied Physics
, Volume 111 (7)
American Institute of Physics – Apr 1, 2012
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