Dynamic signature of orbital selective Mott transition in the metallic phase of VO2
Dynamic signature of orbital selective Mott transition in the metallic phase of VO2
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DOI：
10.1088/1367-2630/aad128
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发表时间：
2018-07
影响因子：
3.3
通讯作者：
Yue Wang;X. Xi;Zefang Li;Enke Liu;Yao Yu;Yue Wu;Guangheng Wu;Wenhong Wang
中科院分区：
文献类型：
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作者：
Yue Wang;X. Xi;Zefang Li;Enke Liu;Yao Yu;Yue Wu;Guangheng Wu;Wenhong Wang
一种轨道选择技术，核磁共振（NMR）光谱，可以同时探测原子结构和电子性质，被用来解决“坏金属”的行为，即，VO2金属相中的电子热导率可忽略不计。通过51V NMR在V站点处测得的电场梯度被发现在结构相变温度附近的纯金属相中显着地演变，根据衍射结构分析，在该温度区域内的简单金属中出乎意料。这种反常的温度依赖性局域对称性演化可以用一个简单的轨道选择性Mott跃迁唯象模型来解释。
An orbital-selective technique, nuclear magnetic resonance (NMR) spectroscopy, which could simultaneously probe the atomic structure and electronic properties, was employed to address the ‘bad metal’ behaviors, i.e., negligible electron thermal conductivity in the metallic phase of VO2. The measured electric field gradients at V sites by 51V NMR were found to evolve significantly in the pure metallic phase within the vicinity of structural phase transition temperatures, unexpected in a simple metal within this temperature region according to structural analysis by diffraction. This abnormal temperature-dependent local symmetry evolution can be well explained by a simple phenomenological model of orbital selective Mott transition in this multiorbital system.