Metallic nonsuperconducting phase and D-wave superconductivity in Zn-substituted La1.85Sr0.15CuO4
Measurements of the resistivity, magnetoresistance, and penetration depth were made on films of La1.85Sr0.15CuO4, with up to 12 at. % of Zn substituted for the Cu. The results show that the quadratic temperature dependence of the inverse square of the penetration depth, indicative of d-wave superconductivity, is not affected by doping. The suppression of superconductivity leads to a metallic nonsuperconducting phase, as expected for a pairing mechanism related to spin fluctuations. The metal-insulator transition occurs in the vicinity of k(F)l approximately 1, and appears to be disorder driven, with the carrier concentration unaffected by doping.
Karpinska
K
Institute of Physics, Polish Academy of Sciences, 02 668 Warsaw, Poland.
Cieplak
MZ
Guha
S
Malinowski
A
Skoskiewicz
T
Plesiewicz
W
Berkowski
M
Boyce
B
Lemberger
TR
Lindenfeld
P