Electron-electron interactions and superconducting fluctuations in weakly localized K3C60

Z. H. Wang; A. W. P. Fung; G. Dresselhaus; M. S. Dresselhaus; K. A. Wang; P. Zhou; P. C. Eklund

doi:10.1103/PhysRevB.47.15354

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Electron-electron interactions and superconducting fluctuations in weakly localized K3C60

Z. H. Wang, A. W. P. Fung, G. Dresselhaus, M. S. Dresselhaus, K. A. Wang, P. Zhou, P. C. Eklund

DOI 10.1103/PhysRevB.47.15354 · Physical Review B

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Abstract

Magnetotransport studies on superconducting K3C60 films are presented. These films are a three-dimensional (3D) weakly localized system with strong electron-electron interactions, reflected by the large positive magnetoresistance (MR). The effects of superconducting fluctuations on the MR are observed in this 3D weakly localized system. The localization is primarily caused by doping-induced disorder rather than granularity and the upper critical field Hc2(T) follows the Werthamer-Helfand-Hohenberg model. An electron mean free path of 10–20 Å is estimated in the normal state just above Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.5	Pressure not reported	unknown
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10	Pressure not reported	zero_resistance
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6	Pressure not reported	zero_resistance