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Studies on Colossal Magnetoresistance Behaviour of Pr0.6Sr0.4MnO3/Pr0.5Ca0.5MnO3 Heterostructure Films

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Abstract

Heterostructure bilayer thin films of Pr0.6Sr0.4MnO3/Pr0.5Ca0.5MnO3 were prepared by pulsed laser deposition, and the structural, magnetic and magnetotransport properties were studied, and the results were compared to that of Pr0.6Sr0.4MnO3 and Pr0.5Ca0.5MnO3 single-layer thin films. Structural analysis of the heterostructure reveals c-axis orientation for both the manganite layers. The heterostructure exhibits a higher metal-insulator transition temperature and a larger colossal magnetoresistance near room temperature than that of the single-layer counterparts. The electrical conduction above the metal-insulator transition could be explained within the realm of the adiabatic small polaron hopping mechanism, with lesser activation energies compared to the single-layer films. Magnetization measurements portray the presence of an unsaturated symmetric hysteresis loop for the heterostructure with the Curie temperature of ~270 K corresponding to the ferromagnetic ordering emanating from Pr0.6Sr0.4MnO3. These results could be qualitatively understood considering the combined effect of strain and ferromagnetic proximity of Pr0.6Sr0.4MnO3 with charge-ordered Pr0.5Ca0.5MnO3 manganite.

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Acknowledgements

The authors acknowledge Ms. DT Sunitha Rajkumari and Dr. S Ilango, Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, for the XRD patterns of thin films. We also acknowledge UGC-DAE-CSR, Kalpakkam Node, for providing access to the 15-T cryogen-free magnetoresistance, SQUID Magnetometer and XRD facilities.

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Authors and Affiliations

  1. Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, 603102, India

    V. Gayathri, T. Geetha Kumary, E. P. Amaladass, A. T. Sathyanarayana & Awadhesh Mani

  2. Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, 603102, India

    V. Gayathri, E. P. Amaladass, A. T. Sathyanarayana & Awadhesh Mani

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  1. V. Gayathri
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Correspondence to Awadhesh Mani.

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Gayathri, V., Kumary, T.G., Amaladass, E.P. et al. Studies on Colossal Magnetoresistance Behaviour of Pr0.6Sr0.4MnO3/Pr0.5Ca0.5MnO3 Heterostructure Films. J Supercond Nov Magn 34, 1955–1960 (2021). https://doi.org/10.1007/s10948-021-05889-9

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