{ital T{sub c}} vs Carrier Concentration in Cubic Fulleride Superconductors
- University of Maryland, College Park, Maryland 20742 and National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
The effect of carrier concentration on fulleride superconductivity is studied by x ray, Raman, magnetization, and ESR of two new {ital cubic} families: Na{sub 2}Cs{sub {ital x}}C{sub 60} (0{lt}{ital x}{lt}1) and {ital M}{sub 3{minus}{ital y}}Ba{sub {ital y}}C{sub 60} (0.2{lt}{ital y}{lt}2, {ital M}=K, Rb or Cs). These are isostructural with known {ital Pa}{bar 3} and {ital Fm}{bar 3}{ital m} trivalent superconductors, respectively, but with variable valence 2{lt}{ital n}{lt}5. {ital T}{sub {ital c}} is peaked at or very near {ital n}=3, decreasing rapidly in either direction to {lt}0.5K for {ital n}=2.5 and 5. These results underscore the failure of both one-electron and strong correlation models to explain the dependence of {ital T}{sub {ital c}} on band filling. {copyright} {ital 1996 The American Physical Society.}
- DOE Contract Number:
- FG02-86ER45254
- OSTI ID:
- 288977
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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