The current and temperature dependent electrical transport is investigated in Pr0.7Ca0.3MnO3/YBa2Cu3O7 (PCMO/YBCO) heterostructures which are fabricated by pulsed laser deposition. Two PCMO/YBCO heterostructures are made with the thicknesses of PCMO varied. It is shown that the superconducting transition temperature significantly decreases with increasing thickness of PCMO and with increasing applied current, which are related to the pair breaking via the polarized electrons. However, the current-dependent normal-state resistivity shows two crossing points, indicating the competition of various phases. According to our analysis, the melting of charge ordering state by the electrical current may be the major cause for the electrically driven enhancement of spin polarization in PCMO/YBCO. The current and temperature dependent electrical transport is investigated in Pr0.7Ca0.3MnO3/YBa2Cu3O7 (PCMO/YBCO) heterostructures which are fabricated by pulsed laser deposition. Two PCMO/YBCO heterostructures are made with the thicknesses of PCMO varied. It is shown that the superconducting transition temperature significantly decreases with increasing thickness of PCMO and with increasing applied current, which are related to the pair breaking via the polarized electrons. However, the current-dependent normal-state resistivity shows two crossing points, indicating the competition of various phases. According to our analysis, the melting of charge ordering state by the electrical current may be the major cause for the electrically driven enhancement of spin polarization in PCMO/YBCO.
Relation:
Journal of Applied Physics 105(7), pp.07E301(3 pages)