Effect of in-plane epitaxy on magnetotransport properties of (La{sub 0.5}Sr{sub 0.5})CoO{sub 3} thin films
- Materials Science and Technology Division, Mail Stop K763, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We have systematically studied the temperature- and magnetic field-dependent resistance in (La{sub 0.5}Sr{sub 0.5})CoO{sub 3} (LSCO) films with various degrees of in-plane texturing using the biaxially oriented LSCO on CeO{sub 2}/YSZ/SiO{sub 2}/Si substrates. We find that the ferromagnetic transition temperature, T{sub c}, is much the same in all samples while the resistive transition exhibits metallic behavior (dR/dT{gt}0) in the epitaxial LSCO to semiconducting behavior (dR/dT{lt}0) in the poorly textured LSCO. The magnetoresistance (MR) in the epitaxial LSCO on a LaAlO{sub 3} substrate displays two distinct regions; the low field hysteretic MR related to the magnetization hysteresis and the high field linear negative MR due to the suppression of spin fluctuations. In contrast, the MR in the biaxially textured LSCO sample shows only the hysteretic behaviors at low fields and no linear MR at high fields. Compared to the polycrystalline-doped LaMnO{sub 3} which shows an enhanced MR at low fields, the MR in the biaxially oriented LSCO does not exhibit such characteristics. We attribute this to the differences in the spin polarization between LSCO and the doped LaMnO{sub 3}. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 639053
- Journal Information:
- Applied Physics Letters, Vol. 73, Issue 5; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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