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1 results

  • Spin scattering effect on thermal transport and nonadiabatic small polaron hopping conduction in layered cobaltite thin film

  • Shengli Huang, Xianfang Zhu, Keqing Ruan, Liezhao Cao
  • Journal:
    Journal of Materials Research / Volume 26 / Issue 4 / 28 February 2011
    Published online by Cambridge University Press:
    11 February 2011, pp. 561-566
    Print publication:
    28 February 2011

  • Transport properties in the a-b plane of Nd0.75Sr1.25CoO4 thin film as fabricated via a pulsed laser deposition technique have been investigated by means of measurements of resistivity and thermopower, respectively, in the temperature ranges of 76-300 and 80-310 K. The thermopower of the specimen revealed a mechanism of spin-dependent scattering of the charge carriers where its conduction could be well interpreted by the small polaron hopping conduction in the nonadiabatic regime at high temperatures and the two-dimensional variable range hopping of small polarons at low temperatures. Possible mechanisms for the polaronic conduction were also discussed in the article where several physical parameters of the specimen were determined using a small polaron hopping model and a better understanding of the strongly correlated electron system was achieved.