Coexistence of Superconductivity and Localization in Bi{sub 2}Sr{sub 2}(Ca{sub {ital z}},Pr{sub 1{minus}{ital z}})Cu{sub 2}O{sub 8+{ital y}}
Journal Article
·
· Physical Review Letters
- II. Physikalisches Institut der Rheinisch-Westfaelische Technische Hochschule Aachen, D-52056 Aachen (Germany)
- Institut fuer Experimentalphysik, Universitaet des Saarlandes, D-66041 Saarbruecken (Germany)
Charge transport in insulating and superconducting samples of Bi{sub 2}Sr{sub 2}(Ca{sub {ital z}},Pr{sub 1{minus}{ital z}})Cu{sub 2}O{sub 8+{ital y}} is analyzed in terms of the Hall mobility {mu}({ital T})={ital R}{sub {ital H}}({ital T})/{rho}({ital T}). Insulating samples ({ital z}{le}0.5) show a crossover from a hopping between localized states at low temperatures ({ital d}{mu}{sup {minus}1}/{ital dT}{lt}0) to a delocalized metallic regime ({ital d}{mu}{sup {minus}1}/{ital dT}{approx_gt}0) at high temperatures. For hole contents just sufficient to obtain superconductivity ({ital z}{approx_gt}0.5) we still observe such a minimum in the inverse mobility, although the resistivity {rho}({ital T}) is purely metallic ({ital d}{rho}/{ital dT}{approx_gt}0). This indicates that the Cooper pairs are formed by states which are spatially localized. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383306
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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