LOCALIZED LEVEL HOPPING TRANSPORT IN LA(SR)CRO3
LOCALIZED LEVEL HOPPING TRANSPORT IN LA(SR)CRO3
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DOI：
10.1103/physrevb.20.2255
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发表时间：
1979-01-01
影响因子：
3.7
通讯作者：
ALDRED, AT
中科院分区：
文献类型：
--
作者：
KARIM, DP;ALDRED, AT
高温测量已经在电子导电氧化物系统La 1− x Sr x Cr O 3（0<~ x<~ 0.4）上进行。电导率显示热激活温度依赖性在300和1900 K之间，活化能在0.11和0.19 eV之间变化。在类似的温度范围内测得的塞贝克系数表现出很小的温度依赖性，这表明载流子迁移率，而不是载流子浓度，是热激活的。的磁化率是居里-外斯-像600和1100 K之间的有效力矩，随着锶浓度的增加而减少。这些结果与小极化子的绝热跳跃输运是一致的。
High-temperature measurements have been performed on the electronically conducting oxide system La 1− x Sr x Cr O 3 (0<~ x<~ 0.4). The electrical conductivity displayed thermally activated temperature dependence between 300 and 1900 K with activation energies that varied between 0.11 and 0.19 eV. Seebeck coefficients measured over a similar temperature range showed little temperature dependence, an indication that the carrier mobility, rather than the carrier concentration, is thermally activated. The magnetic susceptibility was Curie-Weiss-like between 600 and 1100 K with an effective moment that decreased with an increase in strontium concentration. These results are shown to be consistent with transport by the adiabatic hopping of small polarons.