Pressure studies of alkali, alkaline earth and rare earth doped C{sub 60} superconductors
- Sandia National Labs., Albuquerque, NM (United States)
- AT and T Bell Labs., Murray Hill, NJ (United States)
- Pennsylvania Univ., Philadelphia, PA (United States)
Pressure studies of the superconducting transition temperature T{sub c} of the alkali metal doped C{sub 60} compounds helped to establish a universal curve of T{sub c} versus lattice constant upon which nearly all of these materials lie. Various theoretical schemes incorporate this finding and suggest that only the lattice parameter and not the details of the dopant determine T{sub c}. Ca{sub 5}C{sub 60}, the highest T{sub c} member of the alkaline earth doped C{sub 60} superconductor has a T{sub c} which lies on this universal curve so this material, from these considerations, should have the same large negative pressure derivative as the alkali doped superconductors. We have measured dT{sub c}/dP for Ca{sub 5}C{sub 60} and for Yb{sub x}C{sub 60} (x near 3) and find small and positive values indicating that the theoretical models must be expanded to include band structure effects.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10159880
- Report Number(s):
- SAND-94-0063C; CONF-940529-14; ON: DE94013345; BR: GB0103012
- Resource Relation:
- Conference: 185. Electrochemical Society meeting,San Francisco, CA (United States),22-27 May 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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