Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session F22: Superconductivity:Mostly_CuO_2
8:00 AM–10:48 AM,
Tuesday, March 7, 2023
Room: Room 214
Sponsoring
Unit:
DCMP
Chair: Yu He, Yale University
Abstract: F22.00013 : Superfluid density in overdoped cuprates: Thin films versus bulk samples
10:24 AM–10:36 AM
Presenter:
Sasa Dordevic
(University of Akron)
Authors:
Sasa Dordevic
(University of Akron)
Christopher C Homes
(Brookhaven National Laboratory)
several unexpected findings, most notably the violation of the BCS description which was believed to adequately
describe overdoped cuprates. In particular, it was found that the superfluid density in La$_{2−x}$Sr$_x$CuO$_4$
films decreases on the overdoped side as a linear function of critical temperature T$_c$, which was taken as evidence
for the violation of Homes’ law. We show explicitly that the law is indeed violated, and as the main reason
for violation we find that the superfluid density in La$_{2−x}$Sr$_x$CuO$_4$ films is suppressed more strongly than in bulk
samples. Based on the existing literature data, we show that the superfluid density in bulk cuprate samples does
not decrease with doping, but instead tends to saturate on the overdoped side. The result is also supported by our
recent measurement of a heavily overdoped bulk La$_{2−x}$Sr$_x$CuO$_4$ sample. Moreover, this saturation of superfluid
density might not be limited to cuprates, as we find evidence for similar behavior in two pnictide superconductor
families. We argue that quantum phase fluctuations play an important role in suppressing the superfluid density
in thin films.
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