Coexistence of large positive and negative magnetoresistance in La0.7Ca0.3MnO3 films with microcracks |
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| Authors: | Shaojiang Zhu Fuchang ZhangJie Yuan Beiyi ZhuBo Xu Lixin CaoXianggang Qiu Bairu Zhao |
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| Institution: | National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | The coexistence of large positive and negative low-field magnetoresistance (LFMR) in the ferromagnetic La0.7Ca0.3MnO3 thin films with ordered microcrack (MC) distributions is reported. For the films with the highest linear density of MC, the negative LFMR can be up to −60% and rapidly changes to the positive value of 25% at 200 Oe field with the increase of temperature. We discuss the effect based on the spin-polarized tunneling and inhomogeneous magnetic state induced by the natural formations of MC in the films. |
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| Keywords: | 75 47 Gk 68 55 &minus a 85 75 &minus d |
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