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)

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