Field-induced spin-crossover transition of [MnIII(taa)] studied under pulsed magnetic fields

Shojiro Kimura, Yasuo Narumi, Koichi Kindo, Motohiro Nakano, and Gen-etsu Matsubayashi
Phys. Rev. B 72, 064448 – Published 29 August 2005

Abstract

We have performed the high-field magnetization measurements on the spin-crossover complex [MnIII(taa)] (H3taa=tris(1(2azolyl)2azabuten4yl)amine) under pulsed magnetic fields. The field-induced spin-crossover transition is successfully observed. The full conversion from the low to the high spin state by external magnetic field is achieved. The obtained field-temperature phase diagram agrees with the analysis, taking into account the entropy contribution from the dynamic structural disorder in the high spin state of [MnIII(taa)], which was proposed from the recent dielectric measurement. The observed field-induced transition accompanies with large hysteresis. Measurements under the pulsed fields with different sweep rates are conducted in order to clarify the dynamic character of the field-induced spin-crossover. Strong sweep rate dependence of the hysteresis indicates that crossover of the relaxation process takes place upon increasing the sweep rate.

    • Received 17 April 2005

    DOI:https://doi.org/10.1103/PhysRevB.72.064448

    ©2005 American Physical Society

    Authors & Affiliations

    Shojiro Kimura*, Yasuo Narumi, and Koichi Kindo

    • KYOKUGEN, Osaka University, Toyonaka, Osaka 560-8531, Japan

    Motohiro Nakano and Gen-etsu Matsubayashi

    • Graduate School of Engineering, Osaka University, Machikaneyama 1-16, Toyanaka 560-0043, Japan

    • *Electronic address: kimura@hmf.mag.rcem.osaka-u.ac.jp
    • Present address: Institute for Solid State Physics, University of Tokyo, Kashinoha 5-1-5, Kashiwa 277-8581, Japan.

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    Issue

    Vol. 72, Iss. 6 — 1 August 2005

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