Srivastava, M. K. and Agarwal, V. and Kaur, A. and Singh, H. K. (2017) Colossal Magnetoresistance and Phase Separation in Manganite Thin Films. In: 61ST DAE-SOLID STATE PHYSICS SYMPOSIUM, DEC 26-30, 2016, KIIT Univ, Bhubaneswar, INDIA.

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In the present work, polycrystalline Sm0.55Sr0.45MnO3 thin films were prepared on LSAT (001) single crystal substrates by ultrasonic nebulized spray pyrolysis technique. The X-ray diffraction theta-2 theta scan reveals that these films (i) have very good crystallinity, (ii) are oriented along out-of-plane c-direction, and (iii) are under small tensile strain. The impact of oxygen vacancy results into (i) higher value of paramagnetic insulator (PMI) to ferromagnetic metal (FMM) transition temperature, i. e., T-C/T-IM, (ii) sharper PMI-FMM transition, (iii) higher value of magnetization and magnetic saturation moment, and (iv) higher value of magnetoresistance (similar to 99%). We suggest here that oxygen vacancy favors FMM phase while oxygen vacancy annihilation leads to antiferromagnetic-charge ordered insulator (AFM-COI) phase. The observed results have been explained in context of phase separation (PS) caused by different fractions of the competing FMM and AFM-COI phases.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Copyright for this article belongs to M/s AIP Publishing.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 31 May 2019 11:31
Last Modified: 31 May 2019 11:31

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