Spin-polarized quasiparticle transport in cuprate superconductors

Details Spin-polarized quasiparticle transport in cuprate superconductors Spin-polarized quasiparticle transport in cuprate superconductors

2002-06-14

arxiv.org/abs/cond-mat/0206254v1

Phys. Rev. B 65, 224516 (2002)

Physics

Condensed Matter

Superconductivity

14 pages, 6 figures. Published in Physical Review B. Corresponding author: Nai-Chang Yeh (e-mail: ncyeh@caltech.edu)

Scientific paper

10.1103/PhysRevB.65.224516

The effects of spin-polarized quasiparticle transport in superconducting YBa2Cu3O_{7-\delta} (YBCO) epitaxial films are investigated by means of current injection into perovskite ferromagnet-insulator-superconductor (F-I-S) heterostructures. These effects are compared with the injection of simple quasiparticles into control samples of perovskite non-magnetic metal-insulator-superconductor (N-I-S). Systematic studies of the critical current density as a function of the injection current density, temperature and the thickness of the superconductor reveal drastic differences between the F-I-S and N-I-S heterostructures, with strong suppression of the critical currents and a rapidly increasing characteristic transport length near the superconducting transition temperature only in the F-I-S samples. The temperature dependence of the injection efficiency in the F-I-S samples is also in sharp contrast to that in the N-I-S samples. The characteristic times estimated from our studies are suggestive of anisotropic spin relaxation processes, possibly with spin-orbit interaction dominating the c-axis spin transport and exchange interaction prevailing within the CuO2 planes. Several alternative scenarios attempted to account for the suppression of critical currents in F-I-S samples are also critically examined, and are found to be neither compatible with experimental data nor with the established theory of nonequilibrium superconductivity.

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