Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator.
Bi2Se3 is one of a handful of known topological insulators. Here we show that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of approximately 2x10{20} cm{-3}, results in superconductivity at 3.8 K in CuxBi2Se3 for 0.12<or=x<or=0.15. This demonstrates that Cooper pairing is possible in Bi2Se3 at accessible temperatures, with implications for studying the physics of topological insulators and potential devices.
Hor
Y S
YS
Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
Williams
A J
AJ
Checkelsky
J G
JG
Roushan
P
P
Seo
J
J
Xu
Q
Q
Zandbergen
H W
HW
Yazdani
A
A
Ong
N P
NP
Cava
R J
RJ