Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e g system LaMn 7 O 12
Jahn-Teller-induced crossover of the paramagnetic response in the singly valent e g system LaMn 7 O 12
复制标题
单价 LaMn 7 O 12 系统中顺磁响应的 Jahn-Teller 诱导交叉
DOI：
10.1103/physrevb.81.214412
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发表时间：
2010
影响因子：
3.7
通讯作者：
A. Gauzzi
中科院分区：
文献类型：
--
作者：
R. Cabassi;F. Bolzoni;E. Gilioli;F. Bissoli;A. Prodi;A. Gauzzi
我们研究了的高温磁性和输运性质，它表现出类似钙钛矿的结构和相同的单价性质，但Jahn-Teller(JT)失真要简单得多。我们发现，其磁响应与下面的相似，但在上面的未扭曲相中有显著的不同，在那里居里-魏斯磁化率被强烈地抑制。电阻率和热电势测量揭示了从非绝热到绝热小极化子区域的伴随交叉。这表明，上述抑制是由于低自旋电子-空穴二聚体是由Mn位之间的电荷转移形成的，并由上面缓慢的JT动力学稳定。
We investigate the high-temperature magnetic and transport properties of, which displays a similar perovskitelike structure and the same single-valentproperties ofbut a much simpler Jahn-Teller (JT) distortion at. We find that the magnetic response ofis similar to that ofbelow, but strikingly different in the undistorted phase above, where the Curie-Weiss susceptibility is strongly suppressed. Electrical resistivity and thermopower measurements unveil a concomitant crossover from nonadiabatic to adiabatic small polaron regime. This suggests that the above suppression is due to low-spin electron-hole dimers formed by thecharge transfer between Mn sites and stabilized by the slow JT dynamics above.