Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV2O4

Observation of the large magnetocaloric effect in an orbital–spin-coupled system MnV2O4
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DOI：
10.1088/0953-8984/21/43/436010
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发表时间：
2009-10
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
通讯作者：
X. Luo;Y. Sun;L. Hu;B. Wang;W. Lu;X. B. Zhu;Z. R. Yang;W. Song
X. Luo;Y. Sun;L. Hu;B. Wang;W. Lu;X. B. Zhu;Z. R. Yang;W. Song
中科院分区：
其他
文献类型：
--
作者：
X. Luo;Y. Sun;L. Hu;B. Wang;W. Lu;X. B. Zhu;Z. R. Yang;W. Song

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采用磁化测量方法研究了轨道自旋耦合尖晶石钒酸盐MnV2O4的磁热效应。MnV2O4在TC = 57 K时具有铁磁有序。在0-2 T和0-4 T磁场变化时，磁熵变化最大值分别为14.8和24.0 J kg−1 K−1。在2 t的磁场变化下，最大绝热温度约为2.9 K，除了自旋熵变化外，观测到的巨大MCE可能与TC周围外加磁场引起的V3+轨道状态的变化有关。
The magnetocaloric effect (MCE) in an orbital–spin-coupled spinel vanadate MnV2O4 is investigated by magnetization measurement. MnV2O4 has ferrimagnetic ordering occurring at TC = 57 K. The maximum magnetic entropy change reaches 14.8 and 24.0 J kg−1 K−1 for field changes of 0–2 and 0–4 T, respectively. The maximum adiabatic temperature is about 2.9 K for a magnetic field change of 2 T. Except for the spin entropy change, the observed giant MCE is suggested to be related to the orbital entropy change due to the change of the orbital state of V3+ induced by an applied magnetic field around TC.