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Journal of Nanoscience Letters 2013, 3: 13
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Research Article
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Current dependent proximity effects in Pr0.5Ca0.5MnO3/YBa2Cu3O7 bilayer
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Dipak Kumar Baisnab, T. Geetha Kumary, A. T. Satya, Awadhesh Mani, L. S. Vaidhyanathan,
M. P. Janawadkar, A. Bharathi
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Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India
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Abstract |
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The current and magnetic field dependent proximity effect studies have been performed on Pr0.5Ca0.5MnO3/YBa2Cu3O7 (PCMO /YBCO) bilayer thin film fabricated on (100) oriented SrTiO3 substrate employing Pulsed Laser Deposition technique. The formation of the bilayer film has been confirmed by XRD measurement. Temperature dependent resistance R(T) measurements were carried out for different values of measuring current (10 μA - 40 mA) and applied magnetic fields (0-12T). A significant suppression of the superconducting transition temperature (Tc) and a hump like behavior in electrical resistivity near the onset of Tc has been observed for the bilayer. The hump like feature is, however, not observed in measurements carried out on the YBCO side. The results can be explained as arising from the proximity effect of the FM clusters nucleated in the PCMO film upon application of higher values of current as well as injection of quasiparticles from such regions into the YBCO layer.
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Keywords |
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Thin film; Manganites; Superconductivity
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