Spin injection induced phase transition in YBa2Cu3O7−δ/Nd0.35Sr0.65MnO3 bilayer

Abstract

The spin injection effects from C-type antiferromagnetic Nd0.35Sr0.65MnO3 (NSMO) to superconductor YBa2Cu3O7−δ (YBCO) are investigated via the measurement of temperature dependent resistivity with input current from 10−2 mA to 90 mA. The superconducting transition temperature (Tco) of YBCO decreases with increasing current but at a higher rate with larger thickness of NSMO. Two spin states below Tco are identified as non-equilibrium spin-state and pair-breaking state judging from the width of transition. In particular, the transition from former to later one is observed with NSMO = 30 nm at the current of 30 mA.