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

Published online by Cambridge University Press:  10 February 2011

H.-U. Habermeier ,
Xiaohang Li  and
Pengxiang Zhang
H.-U. Habermeier
Affiliation:
Max-Planck-Institut - FKF, Heisenbergstr. 1 D-70569, Stuttgart, Germany Institute of Lasers, Yunnan Polytechnic University, Kunming 650051, P. R. China
Xiaohang Li
Affiliation:
Max-Planck-Institut - FKF, Heisenbergstr. 1 D-70569, Stuttgart, Germany
Pengxiang Zhang
Affiliation:
Max-Planck-Institut - FKF, Heisenbergstr. 1 D-70569, Stuttgart, Germany Institute of Lasers, Yunnan Polytechnic University, Kunming 650051, P. R. China
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 125
Copyright
Copyright © Materials Research Society 2000

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