Direct injection of spin-polarized carriers across YBa2Cu3O7-δ-La0.3Ca0.7MnO3 interface at 77 K |
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| Authors: | K V Upadhye K Ganesh Kumara S C Purandare S P Pai R Pinto |
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| Affiliation: | (1) Department of Physics, Indian Institute of Technology, 400 076 Powai, Mumbai, India;(2) Department of Materials Science, Mangalore University, 574 199 Mangalagangothri, India;(3) Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005 Mumbai, India |
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| Abstract: | We report here injection of spin-polarized carriers from a half-metallic La0.3Ca0.7MnO3 (LCMO) colossal magnetoresistive (CMR) thin film into a high-temperature superconducting YBa2Cu3O7-δ (YBCO) thin film studied using a micro-bridge. The LCMO and YBCO films were grown on 〈100〉 LaAlO3 (LAO) substrate sequentially using pulsed laser deposition (PLD). I-V measurements carried out at 77 K show that while normal critical current, I
c
n
, of the micro-bridge is 80 mA, the critical current, I
c
p
, through the micro-bridge when injected from the CMR layer is 38 mA. This clearly shows that spin-polarized quasiparticles
injected from the the CMR layer into the YBCO layer suppress the critical current of the superconductor via the pair-breaking
phenomena. |
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| Keywords: | Superconducting devices colossal magnetoresistance spin injection |
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