TY - JOUR
T1 - The disorder-free non-BCS superconductor CS3C60 emerges from an antiferromagnetic insulator parent state
AU - Takabayashi, Yasuhiro
AU - Ganin, Alexey Y.
AU - Jeglič, Peter
AU - Arčon, Denis
AU - Takano, Takumi
AU - Iwasa, Yoshihiro
AU - Ohishi, Yasuo
AU - Takata, Masaki
AU - Takeshita, Nao
AU - Prassides, Kosmas
AU - Rosseinsky, Matthew J.
PY - 2009/3/20
Y1 - 2009/3/20
N2 - The body-centered cubic A15-structured cesium fulleride Cs 3C60 is not superconducting at ambient pressure and is free from disorder, unlike the well-studied face-centered cubic A 3C60 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.
AB - The body-centered cubic A15-structured cesium fulleride Cs 3C60 is not superconducting at ambient pressure and is free from disorder, unlike the well-studied face-centered cubic A 3C60 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.
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U2 - 10.1126/science.1169163
DO - 10.1126/science.1169163
M3 - Article
C2 - 19299615
AN - SCOPUS:62849103167
VL - 323
SP - 1585
EP - 1590
JO - Science
JF - Science
SN - 0036-8075
IS - 5921
ER -