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Title: The demise of superfluid density in overdoped La 2-xSr xCuO 4 films grown by molecular beam epitaxy

Abstract

Here, we synthesize La 2–xSr xCuO 4 thin films using atomic layer-by-layer molecular beam epitaxy (ALL-MBE). The films are high-quality—singe crystal, atomically smooth, and very homogeneous. The critical temperature (T c) shows a very little (<1 K) variation within a film of 10×10 mm 2 area. The large statistics (over 2000 films) is crucial to discern intrinsic properties. We measured the absolute value of the magnetic penetration depth λ with the accuracy better than 1 % and mapped densely the entire overdoped side of the La 2–xSr xCuO 4 phase diagram. A new scaling law is established accurately for the dependence of T c on the superfluid density. The scaling we observe is incompatible with the standard Bardeen-Cooper-Schrieffer picture and points to local pairing.

Authors:
 [1];  [1];  [2];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States). Dept. of Applied Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1336155
Report Number(s):
BNL-112666-2016-JA
Journal ID: ISSN 1557-1939; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:  
SC00112704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Superconductivity and Novel Magnetism
Additional Journal Information:
Journal Name: Journal of Superconductivity and Novel Magnetism; Journal ID: ISSN 1557-1939
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high-temperature superconductivity; cuprate; thin films; molecular beam epitaxy; superfluid density

Citation Formats

Bozovic, I., He, X., Wu, J., and Bollinger, A. T. The demise of superfluid density in overdoped La2-xSrxCuO4 films grown by molecular beam epitaxy. United States: N. p., 2016. Web. doi:10.1007/s10948-016-3819-1.
Bozovic, I., He, X., Wu, J., & Bollinger, A. T. The demise of superfluid density in overdoped La2-xSrxCuO4 films grown by molecular beam epitaxy. United States. doi:10.1007/s10948-016-3819-1.
Bozovic, I., He, X., Wu, J., and Bollinger, A. T. Fri . "The demise of superfluid density in overdoped La2-xSrxCuO4 films grown by molecular beam epitaxy". United States. doi:10.1007/s10948-016-3819-1. https://www.osti.gov/servlets/purl/1336155.
@article{osti_1336155,
title = {The demise of superfluid density in overdoped La2-xSrxCuO4 films grown by molecular beam epitaxy},
author = {Bozovic, I. and He, X. and Wu, J. and Bollinger, A. T.},
abstractNote = {Here, we synthesize La2–xSrxCuO4 thin films using atomic layer-by-layer molecular beam epitaxy (ALL-MBE). The films are high-quality—singe crystal, atomically smooth, and very homogeneous. The critical temperature (Tc) shows a very little (<1 K) variation within a film of 10×10 mm 2 area. The large statistics (over 2000 films) is crucial to discern intrinsic properties. We measured the absolute value of the magnetic penetration depth λ with the accuracy better than 1 % and mapped densely the entire overdoped side of the La2–xSrxCuO4 phase diagram. A new scaling law is established accurately for the dependence of Tc on the superfluid density. The scaling we observe is incompatible with the standard Bardeen-Cooper-Schrieffer picture and points to local pairing.},
doi = {10.1007/s10948-016-3819-1},
journal = {Journal of Superconductivity and Novel Magnetism},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 30 00:00:00 EDT 2016},
month = {Fri Sep 30 00:00:00 EDT 2016}
}

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Works referenced in this record:

High-temperature interface superconductivity between metallic and insulating copper oxides
journal, October 2008

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