NDLI: Optical evidence of the weak coupling pairing mechanism in the superconductors K/sub 3/C/sub 60/ and Rb/sub 3/C/sub 60/

Content Provider	IEEE Xplore Digital Library
Author	Degiorgi, L. Nicol, E. Gruner, G. Kaner, R.B. Zettl, A. Wachter, P.
Copyright Year	1994
Description	Author affiliation: UCSB (Degiorgi, L.)
Abstract	Summary form only given, as follows. We will report on our optical investigations on the alkali-doped $C_{60}$ superconductors over a broad energy spectral range (i.e., from 10 $cm^{-1}$ up to $10^{5}$ $cm^{-1})$ and at temperatures below and above T c· The samples were in form of pressed pellet and single crystal. The normal state response (T >> Tc) is characterized by various interband transitions at high frequencies (v > $5x10^{3}$ $cm^{-1})$ and by a broad excitation in the mid-IR, superimposed to a Drude contribution. Below Tc a clear enhancement of the reflectivity is observed in the FIR at frequencies below 100 $cm^{-1},$ with an onset as a function of temperature coincident with Tc. A superconducting gap of about 73 and 48 $cm^{-1}$ is inferred for the Rb- and K-doped $C_{60}$ single crystals, respectively. This is in full agreement with a weak coupling limit of a BCS singlet superconductor and also suggests that the relevant excitation, responsible for the superconducting pairing, is significantly larger than the single particle gap energy. Moreover, we present our calculation of the electrodynamic response above and below Tc with the standard Eliashberg electron - phonon theory of superconductivity, which strongly supports a pairing mechanism mediated by high frequency intramolecular phonon modles.
Starting Page	20
Ending Page	20
File Size	99775
Page Count	1
File Format	PDF
DOI	10.1109/STSM.1994.834661
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-07-24
Publisher Place	Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Reflectivity Temperature distribution Biomedical optical imaging Superconductivity Doping Frequency Optical coupling
Content Type	Text
Resource Type	Article

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