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Anomalous disappearance of high-T/sub c/ superconductivity at high hole concentration in metallic La/sub 2-//sub x/Sr/sub x/CuO/sub 4/

Journal Article · · Phys. Rev. Lett.; (United States)
Samples of La/sub 2-//sub x/Sr/sub x/CuO/sub 4-//sub delta/ have previously shown a maximum concentration of p = 0.15 holes per (CuO/sub 2/) unit, because increasing x>0.15 normally induces compensating oxygen vacancies. Annealing samples in 100 bars of oxygen pressure fills the oxygen vacancies and greatly increases the range of accessible hole concentrations, up to p = 0.40 (or effectively Cu/sup +2.40/). We find that T/sub c/ is constant at approx.36 K from p = 0.15 to 0.24, where it begins to decrease. Beyond papprox. =0.32, superconductivity disappears, even though the samples are more conducting.
Research Organization:
IBM Research Division, Almaden Research Center, San Jose, California 95120
OSTI ID:
6866220
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 61:9; ISSN PRLTA
Country of Publication:
United States
Language:
English