TY - JOUR
T1 - Superconducting transition tuned by spin-polarized carrier injection in YBa2Cu3Oy/LaAlO3/La 0.7Ca0.3MnO3 heterostructures
AU - Nojima, T.
AU - Iwata, M.
AU - Hyodo, T.
AU - Nakamura, S.
AU - Kobayashi, N.
PY - 2004/10
Y1 - 2004/10
N2 - The effect of spin-polarized carrier injection on superconducting transition has been studied on YBa2Cu3O y/LaAlO3/La0.7Ca0.3MnO3 (superconductor/insulator/ferromagnet) heterostructures. Under the influence of spin-polarized current Iinj injected from the ferromagnetic layers, we have observed a strong suppression of the critical current Ic with the efficiency as large as 4.4 and a shift of the resistive transition curve R(T) to the low temperature side in the superconducting layer. In the measurements of the tunnel current-voltage (Iinj-VT) characteristics between the ferromagnetic layer and the superconducting one, a continuous kink, which leads to a drastic decrease in the differential conductance dIinj/dVT is found at a current, where R appears and Ic disappears. This anomaly is ascribed to the second order phase transition from the superconducting state to the normal one induced by Iinj.
AB - The effect of spin-polarized carrier injection on superconducting transition has been studied on YBa2Cu3O y/LaAlO3/La0.7Ca0.3MnO3 (superconductor/insulator/ferromagnet) heterostructures. Under the influence of spin-polarized current Iinj injected from the ferromagnetic layers, we have observed a strong suppression of the critical current Ic with the efficiency as large as 4.4 and a shift of the resistive transition curve R(T) to the low temperature side in the superconducting layer. In the measurements of the tunnel current-voltage (Iinj-VT) characteristics between the ferromagnetic layer and the superconducting one, a continuous kink, which leads to a drastic decrease in the differential conductance dIinj/dVT is found at a current, where R appears and Ic disappears. This anomaly is ascribed to the second order phase transition from the superconducting state to the normal one induced by Iinj.
KW - Critical current
KW - LaCaMnO
KW - Spin injection
KW - Tunnel conductance
KW - YBaCu O
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U2 - 10.1016/j.physc.2004.01.038
DO - 10.1016/j.physc.2004.01.038
M3 - Article
AN - SCOPUS:4644266111
SN - 0921-4534
VL - 412-414
SP - 147
EP - 151
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - SPEC. ISS.
ER -