Orbital fluctuations in spinel Mn(V 1-xAl x) 2O 4 studied by thermal conductivity measurements
Orbital fluctuations in spinel Mn(V 1-xAl x) 2O 4 studied by thermal conductivity measurements
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DOI：
10.1103/physrevb.86.054436
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
T. Ōmura;T. Ishikawa;Y. Ishitsuka;T. Katsufuji
中科院分区：
文献类型：
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作者：
T. Ōmura;T. Ishikawa;Y. Ishitsuka;T. Katsufuji
我们在外加磁场下测量了尖晶石mnvoo和al掺杂样品的热导率，发现它们在低温下表现出轨道和自旋有序。我们发现，在温度和磁场的变化下，当系统接近轨道有序临界点时，轨道无序相的热电阻率（导热系数）增强，但当系统越过临界点进入轨道有序相时，热电阻率被抑制。这一结果表明，这些化合物的热导率主要受Vorbitals波动的影响。
We measured the thermal conductivity of spinel MnVOand Al-doped samples with an applied magnetic field, and they exhibited orbital and spin ordering at low temperatures. We found that the thermal resistivity (reciprocal thermal conductivity) in the orbital-disordered phase is enhanced when the system approaches the critical point of the orbital ordering under the variation of both temperature and magnetic field, but it is suppressed when it crosses the critical point and goes into the orbital-ordered phase. This result indicates that the thermal conductivity of these compounds is dominated by the fluctuation of Vorbitals.