Electric resistance and magnetoresistance of 30-nm-Thick La0.67Ca0.33MnO3 films elastically compressed in the (110) plane |
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| Authors: | Yu. A. Boikov M. P. Volkov |
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| Affiliation: | (1) Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Anhui, 230026 Hefei, China;(2) International Center for Materials Physics, Academia Sinica, Shenyang, 110015, China; |
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| Abstract: | We have studied the structure, electric resistance, and magnetoresistance of 30-nm-thick (110)La0.67Ca0.33MnO3 (LCMO) films grown by laser deposition on (001)-oriented LaAlO3 substrates. The unit cell parameters a and b (along the [100] and [010]LCMO axes, respectively) of these manganite films are significantly (by ∼1.2%) increased as compared to the corresponding values in the pseudocubic unit cell of bulk stoichiometric LCMO crystals. At T < 150 K, the temperature dependence of the resistivity of LCMO films is well described by the relation ρ = ρ1 + ρ2 (H) T 4.5. The value of ρ 2 decreases with increasing magnetic field and is close to the analogous coefficient for manganite films grown on substrates with small lattice misfit. |
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