TY - JOUR
T1 - Planar tunnel junctions on 90 K and 60 K YBCO single crystals. Superconducting and normal state properties
AU - Cucolo, A. M.
AU - Dynes, R. C.
AU - Valles, J. M.
AU - Schneemeyer, L. F.
PY - 1991/8/15
Y1 - 1991/8/15
N2 - We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with Tc=90 K and Tc=60 K. Natural barriers of good quality have been obtained on both compounds. In comparison with the 90 K phase, the superconducting conductance curves of the 60 K phase show gap-like structures reduced in amplitude and shifted towards higher energies. For the higher Tc material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T>Tc, are highly linear in voltage on both compounds and have steeper slopes on the 60 K phase. The slopes are quite insensitive to temperature variations, and do not depend on the junction resistances nor on the materials used as counterelectrodes.
AB - We have studied the tunneling characteristics of planar junctions made on YBCO single crystals with Tc=90 K and Tc=60 K. Natural barriers of good quality have been obtained on both compounds. In comparison with the 90 K phase, the superconducting conductance curves of the 60 K phase show gap-like structures reduced in amplitude and shifted towards higher energies. For the higher Tc material, a gap opening, at about 90 K, is observed. Normal state conductances, measured at T>Tc, are highly linear in voltage on both compounds and have steeper slopes on the 60 K phase. The slopes are quite insensitive to temperature variations, and do not depend on the junction resistances nor on the materials used as counterelectrodes.
UR - http://www.scopus.com/inward/record.url?scp=0026202686&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(91)90012-N
DO - 10.1016/0921-4534(91)90012-N
M3 - Article
AN - SCOPUS:0026202686
SN - 0921-4534
VL - 179
SP - 69
EP - 74
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 1-3
ER -