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Evidence of Anisotropic Thermoelectric Properties in La2/3Ca1/3MnO3 Thin Films Studied by Laser-Induced Transient Voltages

  • H.-U. Habermeier (a1) (a2), Xiaohang Li (a1) and Pengxiang Zhang (a1) (a2)

Abstract

Pulsed UV laser illumination of doped LaMnO3 thin films deposited on vicinal cut SrTiO3 [ STO ] substrates causes unexpected transient voltages at room temperature in remarkable analogy to those observed for intrinsically anisotropic YBa3Cu3O7−x , [YBCO] thin films. The experimental data for La2/3Ca1/3MnO3 [LCMO] thin films are consistent with the description of thermoelectric fields caused by off-diagonal elements of the Seebeck tensor. Systematic measurements of the dependence of the laser-induced signal on the geometry of the sample, the temperature and doping dependence suggest that the anisotropy of the Seebeck tensor is due to combination of long range co-operative Jahn-Teller distortions and substrate-induced biaxial strain effects.

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