Drift mobility measurements of small-polaron transport in SrTiO3
Drift mobility measurements of small-polaron transport in SrTiO3
复制标题
SrTiO3 中小极化子输运的漂移迁移率测量
DOI：
10.1088/0022-3719/17/5/013
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
J. Brebner
中科院分区：
文献类型：
--
作者：
D. Keroack;Y. Lépine;J. Brebner
用瞬变电荷技术测量了纯钛酸锶的输运。测量了低温下的捕获时间和100~400K温度范围内的漂移迁移率。结果表明，漂移迁移率在高温下被激活，对于一个样品，漂移迁移率在低温下呈指数增加。这一行为被解释为小极化子输运的证据，在同一样品上可以看到跳跃型和带型迁移率，其转变温度约为180K。在低温下，这种行为还取决于杂质含量。从电子-声子相互作用的屏蔽角度描述了与掺杂或还原样品中较大的非激活迁移率相比，较小的激活迁移率(0.1cm2 V~(-1)S~(-1))。
Transient-charge-technique transport measurements have been made on pure strontium titanate. The trapping times at low temperature and the drift mobility for temperatures between 100 and 400K have been measured. It is found that the drift mobility is activated at high temperature and that, for one sample, it increases exponentially at low temperature. This behaviour is interpreted as evidence for small-polaron transport, both hopping- and band-type mobility being seen on the same sample with a transition temperature of about 180K. At low temperature the behaviour also depends on the impurity content. The relatively small (0.1 cm2 V-1 s-1) activated mobility, as compared with the larger nonactivated mobilities in doped or reduced samples, is described in terms of the screening of the electron-phonon interaction.