Scanning SQUID characterization of extremely overdoped La2-xSrxCuO4

Herrera, Chloe; Franklin, Jacob; Božović, Ivan; He, Xi; Sochnikov, Ilya

doi:10.1103/physrevb.103.024528

Title: Scanning SQUID characterization of extremely overdoped La_2-xSr_xCuO₄

Journal Article · Wed Jan 27 00:00:00 EST 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.024528· OSTI ID:1762753

Herrera, Chloe ^[1]; Franklin, Jacob ^[2];

^[3]; He, Xi ^[4];

^[5]

Univ. of Connecticut, Storrs, CT (United States); Lux Research, Boston, MA (United States)
Univ. of Connecticut, Storrs, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Connecticut, Storrs, CT (United States); Univ. of Connecticut, Storrs, CT (United States). Inst. of Material Science

Recently, advances in film synthesis methods have enabled a study of extremely overdoped ${La}_{2 - x} {Sr}_{x} Cu O_{4}$ . This has revealed a surprising behavior of the superfluid density as a function of doping and temperature, the explanation of which is vividly debated. One popular class of models posits electronic phase separation, where the superconducting phase fraction decreases with doping, while some competing phase (e.g., ferromagnetic) progressively takes over. A problem with this scenario is that all the way up to the dome edge the superconducting transition remains sharp, according to mutual inductance measurements. However, the physically relevant scale is the Pearl penetration depth $Λ_{P}$ , and this technique probes the sample on a length scale $L$ that is much larger than $Λ_{P}$ . In the present paper, we use local scanning superconducting quantum interference device (SQUID) measurements that probe the susceptibility of the sample on the scale $L << Λ_{P}$ . Our SQUID maps show uniform landscapes of susceptibility and excellent overall agreement of the local penetration depth data with the bulk measurements. Overall, these results contribute an important piece to the puzzle of how high-temperature superconductivity vanishes on the overdoped side of the cuprate phase diagram.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation

Grant/Contract Number:: SC0012704; GBMF9074

OSTI ID:: 1762753

Report Number(s):: BNL-220893-2021-JAAM; TRN: US2205904

Journal Information:: Physical Review B, Vol. 103, Issue 2; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Scanning SQUID characterization of extremely overdoped La_2-xSr_xCuO₄