The disorder-free non-BCS superconductor Cs3C60 emerges from an antiferromagnetic insulator parent state

Takabayashi, Y. et al. (2009) The disorder-free non-BCS superconductor Cs3C60 emerges from an antiferromagnetic insulator parent state. Science, 323(5921), pp. 1585-1590. (doi:10.1126/science.1169163)

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Abstract

The body-centered cubic A15-structured cesium fulleride Cs3C60 is not superconducting at ambient pressure and is free from disorder, unlike the well-studied face-centered cubic A3C60 alkali metal fulleride superconductors. We found that in Cs3C60, where the molecular valences are precisely assigned, the superconducting state at 38 kelvin emerges directly from a localized electron antiferromagnetic insulating state with the application of pressure. This transition maintains the threefold degeneracy of the active orbitals in both competing electronic states; it is thus a purely electronic transition to a superconducting state, with a dependence of the transition temperature on pressure-induced changes of anion packing density that is not explicable by Bardeen-Cooper-Schrieffer (BCS) theory.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ganin, Dr Alexey
Authors: Takabayashi, Y., Ganin, A.Y., Jeglic, P., Arcon, D., Takano, T., Iwasa, Y., Ohishi, Y., Takata, M., Takeshita, N., Prassides, K., and Rosseinsky, M. J.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Science
Publisher:American Association for the Advancement of Science
ISSN:0036-8075

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