Transport properties of La1.85-xSr0.15+x Cu1-xMxOy (M=Co,Ga)

Xu Gaojie, Zhiqiang Mao, Jin Hao, Yan Hongjie, Wang Bin, Liu Dengpan, Zhang Yuheng

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Abstract

The transport properties of double doped samples La1.85-xSr0.15+xCu1-xCoxO y, (0≤x≤1.0) are investigated by means of resistivity and thermoelectric power (TEP). It is found that with Co doping, the lattice parameter a increases first and then decreases as x≥0.6, where the resistivity and thermoelectric power exhibit a corresponding anomaly. Analyzing the discrepancy of the thermal activation energy derived from the resistivity and TEP, we find that the transport mechanism can be understood in terms of the polaron model. The corresponding Ga doped system is also analyzed as a comparison. Another interesting phenomenon is the different change of the broad peaks in S-T curves between Co and Ga doped systems, which is discussed according to the change of spin correlation.

Original languageEnglish (US)
Pages (from-to)12090-12094
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number18
StatePublished - May 1 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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