Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-14
Phys. Rev. Lett. 105, 256804 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Accepted in PRL
Scientific paper
10.1103/PhysRevLett.105.256804
The proximity effect in a model manganite-cuprate system is investigated theoretically. We consider a situation in which spin-polarized electrons in manganite layers antiferromagnetically couple with electrons in cuprate layers as observed experimentally. The effect of the interfacial magnetic coupling is found to be much stronger than the injection of spin-polarized electrons into the cuprate region. As a result, the superconducting transition temperature depends on the thickness of the cuprate layer significantly. Since the magnetic coupling creates {\em negative} spin polarization, an applied magnetic field and the negative polarization compete resulting in the inverse spin-switch behavior where the superconducting transition temperature is increased by applying a magnetic field.
Okamoto Satoshi
Salafranca Juan
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