Publication Type:Journal Article
Source:Applied Physics Letters, American Institute of Physics Inc., Volume 71, Number 12, p.1718-1720 (1997)
Keywords:Critical current density (superconductivity), Electric conductivity measurement, Electron transport properties, Equilibrium density of pairs, Gain measurement, Heterojunctions, High temperature superconductors, Joule heating, lanthanum compounds, Magnetic relaxation, magnetoresistance, Neodymium compounds, Polarization, spin dynamics, Spin polarized quasiparticle injection device, Superconducting devices, Transport measurement, yttrium compounds
Oxide heterostructures were used for studies of quasiparticle injection effects in high-Tc superconducting thin films. The effect of injection of spin polarized quasiparticles from a ferromagnetic gate layer was compared to that of unpolarized quasiparticles from a nonmagnetic metallic gate. Transport measurements of the superconducting layer showed strong suppression in the supercurrent by the injection of spin-polarized quasiparticles, and a current gain of as large as five was attained. This is 10 to 30 times larger than the gain of unpolarized injection devices. Such large effects could be useful in a variety of active high-Tc superconductor/colossal magnetoresistance heterostructure based devices. © 1997 American Institute of Physics.
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