Perturbing the superconducting planes in CeCoIn5 by Sn substitution.
In contrast to substitution on the Co or Ce site, Sn substitution has a remarkably strong effect on superconductivity in CeCoIn5-xSnx, with Tc-->0 beyond only 3.6% Sn. Instead of being randomly distributed on in-plane and out-of-plane In sites, extended x-ray absorption fine structure measurements show the Sn atoms preferentially substitute within the Ce-In plane. This result highlights the importance of the In1 site to impurity scattering and clearly demonstrates the two-dimensional nature of superconductivity in CeCoIn5.
Daniel
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M
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Bauer
E D
ED
Han
S-W
SW
Booth
C H
CH
Cornelius
A L
AL
Pagliuso
P G
PG
Sarrao
J L
JL