Coexistence of Superconductivity and Localization in Bi2Sr2(Caz, Pr1−z)Cu2O8+y
B. Beschoten, S. Sadewasser, G. Güntherodt, C. Quitmann
DOI 10.1103/PhysRevLett.77.1837 · Physical Review Letters
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Abstract
Charge transport in insulating and superconducting samples of Bi2Sr2(Caz, Pr1−z)Cu2O8+y is analyzed in terms of the Hall mobility μ(T)=RH(T)ρ(T). Insulating samples (z≤0.5) show a crossover from a hopping between localized states at low temperatures (dμ−1dT<0) to a delocalized metallic regime (dμ−1dT>0) at high temperatures. For hole contents just sufficient to obtain superconductivity (z>0.5) we still observe such a minimum in the inverse mobility, although the resistivity ρ(T) is purely metallic (dρdT>0). This indicates that the Cooper pairs are formed by states which are spatially localized.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2(Caz,Pr1-z)Cu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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