Superfluid density in overdoped cuprates: Thin films versus bulk samples

Dordevic, Sasa V.; Homes, Christopher C.

doi:10.1103/physrevb.105.214514

Superfluid density in overdoped cuprates: Thin films versus bulk samples

Journal Article · Tue Jun 21 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.214514· OSTI ID:1871828

^[1]; ^[2]

Univ. of Akron, OH (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Recent study of overdoped La_2–xSr_xCuO₄ cuprate superconductor thin films by Božovic et al. has revealed 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–xSr_xCuO₄ 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. Here we show explicitly that the law is indeed violated, and as the main reason for violation we find that the superfluid density in Božovic's 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–xSr_xCuO₄ 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012704

OSTI ID:: 1871828

Alternate ID(s):: OSTI ID: 1889155

Report Number(s):: BNL-223053-2022-JAAM; BNL-223451-2022-JAAM

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Superfluid density in overdoped cuprates: Thin films versus bulk samples

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