TY - JOUR

T1 - Anomalous transport in normal-superconducting and ferromagnetic-superconducting nanostructures

AU - Seviour, R.

AU - Lambert, C. J.

AU - Volkov, A. F.

PY - 1999/3/1

Y1 - 1999/3/1

N2 - We have calculated the temperature dependence of the conductance variation [δS(T)] of mesoscopic superconductor–normal-metal (S/N) structures, in the diffusive regime, analyzing both weak and strong proximity effects. We show that in the case of a weak proximity effect there are two peaks in the dependence of δS(T) on temperature. One of them (known from previous studies) corresponds to a temperature T1 of order of the Thouless energy (εTh), and another, newly predicted maximum, occurs at a temperature T2 where the energy gap in the superconductor Δ(T2) is of order εTh. In the limit Lφ<L the temperature T1 is determined by Dħ/L2φ(Lφ is the phase breaking length), and not εTh. We have also calculated the voltage dependence δS(V) for a S/F structure (F is a ferromagnet) and predict nonmonotonic behavior at voltages of order the Zeeman splitting.

AB - We have calculated the temperature dependence of the conductance variation [δS(T)] of mesoscopic superconductor–normal-metal (S/N) structures, in the diffusive regime, analyzing both weak and strong proximity effects. We show that in the case of a weak proximity effect there are two peaks in the dependence of δS(T) on temperature. One of them (known from previous studies) corresponds to a temperature T1 of order of the Thouless energy (εTh), and another, newly predicted maximum, occurs at a temperature T2 where the energy gap in the superconductor Δ(T2) is of order εTh. In the limit Lφ<L the temperature T1 is determined by Dħ/L2φ(Lφ is the phase breaking length), and not εTh. We have also calculated the voltage dependence δS(V) for a S/F structure (F is a ferromagnet) and predict nonmonotonic behavior at voltages of order the Zeeman splitting.

KW - quantum dots

KW - superconductors (materials)

KW - superconducting electrodes

UR - http://www.scopus.com/inward/record.url?scp=0001703750&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.59.6031

DO - 10.1103/PhysRevB.59.6031

M3 - Article

AN - SCOPUS:0001703750

VL - 59

SP - 6031

EP - 6034

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 2469-9950

IS - 9

ER -