Journal
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
Volume 249, Issue 5, Pages 995-998Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.201100723
Keywords
exotic superconductors; strong correlations
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Funding
- DOE [DE-FG02-06ER46315]
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We posit that there exist deep and fundamental relationships between the above seemingly very different materials. The carrier concentration-dependences of the electronic behavior in the conducting organic charge-transfer solids and layered cobaltates are very similar. These dependences can be explained within a single theoretical model, the extended Hubbard Hamiltonian with significant nearest neighbor Coulomb repulsion. Interestingly, superconductivity in the cobaltates seems to be restricted to bandfilling exactly or close to one-quarter, as in the organics. We show that dynamic JahnTeller effects and the resultant orbital ordering can lead to 1/4-filled band descriptions for both superconducting spinels and fullerides, which show evidence for both strong electronelectron and electronphonon interactions. The orbital orderings in antiferromagnetic lattice-expanded bcc M3C60 and the superconductor are different in our model. Strong correlations, quarter-filled band and lattice frustration are the common characteristics shared by these unusual superconductors.
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