Direct injection of spin-polarized carriers across YBa2Cu3O7-𝛿–La0.3Ca0.7MnO3 interface at 77 K

Pramana

K V Upadhye³  K Ganesh Kumara¹  R Pinto3²  S P Pai²  S C Purandare² 

[1] Department of Materials Science, Mangalore University, Mangalagangothri 574 199, India$$;Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$;Department of Physics, Indian Institute of Technology, Powai, Mumbai 400 076, India$$

关键词: Superconducting devices;    colossal magnetoresistance;    spin injection.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

We report here injection of spin-polarized carriers from a half-metallic La0.3-Ca0.7MnO3 (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 $langle 100angle$ LaAlO3 (LAO) substrate sequentially using pulsed laser deposition (PLD). 𝐼-𝑉 measurements carried out at 77 K show that while normal critical current, $I^{n}_{c}$, of the micro-bridge is 80 mA, the critical current, $I^{p}_{c}$, through the micro-bridge when injected from the CMR layer is 38 mA. This clearly shows that spin-polarized quasiparticles injected from the CMR layer into the YBCO layer suppress the critical current of the superconductor via the pair-breaking phenomena.

【 授权许可】

Unknown