TY - JOUR
T1 - Tunneling spectroscopy for ferromagnet/superconductor junctions
AU - Žutić, Igor
AU - Valls, Oriol T.
PY - 2000
Y1 - 2000
N2 - In tunneling spectroscopy studies of ferromagnet/superconductor (F/S) junctions, the effects of spin polarization, Fermi wave-vector mismatch (FWM) between the F and S regions, and interfacial resistance play a crucial role. We study the low bias conductance spectrum of these junctions, governed by Andreev reflection at the F/S interface. We present results for a range of values of the relevant parameters and find that a rich variety of features appears, depending on pairing state and other conditions. We show that in the presence of FWM, spin polarization can enhance Andreev reflection and give rise to a zero-bias conductance peak for an s-wave superconductor. This implies that the extraction of spin polarization from measurements in F/S structures requires careful analysis. We consider both d- and s-wave superconductors as well as mixed states of the (Formula presented) form and find that mixed states can have a different signature.
AB - In tunneling spectroscopy studies of ferromagnet/superconductor (F/S) junctions, the effects of spin polarization, Fermi wave-vector mismatch (FWM) between the F and S regions, and interfacial resistance play a crucial role. We study the low bias conductance spectrum of these junctions, governed by Andreev reflection at the F/S interface. We present results for a range of values of the relevant parameters and find that a rich variety of features appears, depending on pairing state and other conditions. We show that in the presence of FWM, spin polarization can enhance Andreev reflection and give rise to a zero-bias conductance peak for an s-wave superconductor. This implies that the extraction of spin polarization from measurements in F/S structures requires careful analysis. We consider both d- and s-wave superconductors as well as mixed states of the (Formula presented) form and find that mixed states can have a different signature.
UR - http://www.scopus.com/inward/record.url?scp=4243807354&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4243807354&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.61.1555
DO - 10.1103/PhysRevB.61.1555
M3 - Article
AN - SCOPUS:4243807354
SN - 1098-0121
VL - 61
SP - 1555
EP - 1566
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 2
ER -