Abstract
We report the strong suppression of YBa2Cu3Oy (YBCO) supercurrent by tunnel injection of spin-polarized quasiparticles using a cobalt ferromagnetic injector. The injection of spin-polarized quasiparticles generates a substantially larger nonequilibrium population as compared with that of an unpolarized injection current. The measurements of transport properties for the directionally oriented spin-polarized quasiparticle injection on the [001] axis and the [110] surfaces of YBCO thin film show anisotropic behaviour according to the junction orientation.
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