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Structural, magnetic, transport, and thermoelectric properties of the pseudobrookiteAlTi2O5−Ti3O5system
Physical Review Materials ( IF 3.4 ) Pub Date : 2020-07-06 , DOI: 10.1103/physrevmaterials.4.074401
Ryusei Takahama , Toi Ishii , Daigo Indo , Mitsutoshi Arizono , Chieko Terakura , Yoshinori Tokura , Nao Takeshita , Masaaki Noda , Hideki Kuwahara , Takuo Saiki , Takuro Katsufuji , Ryoichi Kajimoto , Tetsuji Okuda

We investigated the structural, magnetic, transport, and high-temperature thermoelectric properties of single crystals of the pseudobrookite Al1xTi2+xO5 for 0x1 grown using a floating zone. We found a correlation of spin-singlet Ti3+Ti3+ dimers coupled with the lattice even in the conductive α and λ phases which develops with increasing x. This developing dimer correlation reduces the number of unpaired Ti3+ ions, which makes the compound more conductive owing to the suppression of disorder for x up to about 0.75. The dimer fluctuation causes a critical enhancement of the magnetic susceptibility at around 150 K in the λ phase near the boundary (x0.9) between the λ and the β phases. Such a correlation of the spin-singlet Ti3+Ti3+ dimers may produce a high Seebeck coefficient in the conductive α and λ phases leading to a large thermoelectric power factor at high temperatures.

中文翻译:

假板钛矿AlTi2O5-Ti3O5系统的结构,磁,输运和热电性质

我们研究了假板钛矿单晶的结构,磁,输运和高温热电性质 1个-X2+XØ5 对于 0X1个使用浮动区域生长。我们发现自旋单峰的相关性3+-3+ 甚至在导电中也与晶格耦合的二聚体 αλ 随着增加而发展的阶段 X。这种发展中的二聚体相关性减少了未配对的数量3+ 离子,由于抑制杂乱无章,使化合物更具导电性 X最高约0.75。二聚体的起伏会导致在150 K附近的磁化率显着提高。λ 边界附近的相位(X0.9) 在。。之间 λβ阶段。自旋单峰的这种相关性3+-3+ 二聚体可能在导电中产生高塞贝克系数 αλ 相导致高温下产生较大的热电功率因数。
更新日期:2020-07-06
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