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Twin-microstructure enhanced magnetoresistance in La0.67Ba0.33MnO3 oxides |
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| Authors: | YB Zhang S Li T Sritharan |
| Institution: | a School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore b School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia c School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore |
| Abstract: | The grain growth dependence of microstructure and its effects on magnetic and transport properties are studied in the polycrystalline La0.67Ba0.33MnO3 oxides. It is found that a lateral growth manner along a certain direction and a concentric terrace pattern along three orthogonal axes occur in the samples sintered at 1573 and 1673 K, respectively. Lamella-like twin microstructure forms in the concentric terrace growth pattern and the magnetoresistance properties can be enhanced by the twin microstructure. It suggests that the twin-boundaries in twin-grains may possibly induce spin-dependent scattering of electrons that is field reduced, or spin-polarized tunneling of electrons that is field enhanced, thus strengthening the effect of grain boundaries. |
| Keywords: | 61 72 Mm 75 60 Ej 75 70 Pa |
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