Spin-polarized quasiparticle injection effects in YBCO thin films
S. Soltan, J. Albrecht, and H. -U. Habermeier
TL;DR
This study investigates how injecting spin-polarized quasiparticles from a ferromagnetic layer affects the transport properties of YBCO superconducting films, revealing resistance drops linked to pseudogap phenomena.
Contribution
It demonstrates the effects of spin-polarized quasiparticle injection on YBCO's resistance, highlighting anisotropic impacts along different crystal axes.
Findings
Resistance drops in the ab-plane due to c-axis injection
Evidence of pseudogap opening related to quasiparticle injection
Anisotropic effects observed along different crystal directions
Abstract
We report detailed transport studies on ferromagnet-superconductor heterostructures. Epitaxial heterostructures of half-metal colossal magnetoresistive La2/3Ca1/3MnO3 (HM-CMR) and high Tc superconducting YBa2Cu3O7 (YBCO) are grown on SrTiO3 (100) single crystal substrates by pulsed laser deposition. Using the HM--CMR layer as source for spin-polarized quasiparticles, we show the effect of injection of spin-polarized quasiparticles into the ab-plane and along the c-axis of YBCO. The results show a drop in the ab-plane resistance Rab (T) in the case of injection along the c-axis that is discussed to be related to the opening of a pseudogap.
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