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Title: Dependence of the critical temperature in overdoped copper oxides on superfluid density

Abstract

The physics of underdoped copper oxide superconductors, including the pseudogap, spin and charge ordering and their relation to superconductivity, is intensely debated. The overdoped copper oxides are perceived as simpler, with strongly correlated fermion physics evolving smoothly into the conventional Bardeen–Cooper–Schrieffer (BCS) behaviour. Pioneering studies on a few overdoped samples indicated that the superfluid density was much lower than expected, but this was attributed to pair-breaking, disorder and phase separation. Here we report the way in which the magnetic penetration depth and the phase stiffness depend on temperature and doping by investigating the entire overdoped side of the La2-xSrxCuO4 phase diagram. We measured the absolute values of the magnetic penetration depth and the phase stiffness to an accuracy of one per cent in thousands of samples; the large statistics reveal clear trends and intrinsic properties. The films are homogeneous; variations in the critical superconducting temperature within a film are very small (less than one kelvin). At every level of doping the phase stiffness decreases linearly with temperature. The dependence of the zero-temperature phase stiffness on the critical superconducting temperature is generally linear, but with an offset; however, close to the origin this dependence becomes parabolic. In conclusion, this scaling lawmore » is incompatible with the standard BCS description.« less

Authors:
 [1];  [1];  [2];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States). Applied Physics Dept.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1302997
Alternate Identifier(s):
OSTI ID: 1336197
Report Number(s):
BNL-112397-2016-JA; BNL-113191-2016-JA
Journal ID: ISSN 0028-0836; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 536; Journal Issue: 7616; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Božović, I., He, X., Wu, J., and Bollinger, A. T.. Dependence of the critical temperature in overdoped copper oxides on superfluid density. United States: N. p., 2016. Web. https://doi.org/10.1038/nature19061.
Božović, I., He, X., Wu, J., & Bollinger, A. T.. Dependence of the critical temperature in overdoped copper oxides on superfluid density. United States. https://doi.org/10.1038/nature19061
Božović, I., He, X., Wu, J., and Bollinger, A. T.. Wed . "Dependence of the critical temperature in overdoped copper oxides on superfluid density". United States. https://doi.org/10.1038/nature19061. https://www.osti.gov/servlets/purl/1302997.
@article{osti_1302997,
title = {Dependence of the critical temperature in overdoped copper oxides on superfluid density},
author = {Božović, I. and He, X. and Wu, J. and Bollinger, A. T.},
abstractNote = {The physics of underdoped copper oxide superconductors, including the pseudogap, spin and charge ordering and their relation to superconductivity, is intensely debated. The overdoped copper oxides are perceived as simpler, with strongly correlated fermion physics evolving smoothly into the conventional Bardeen–Cooper–Schrieffer (BCS) behaviour. Pioneering studies on a few overdoped samples indicated that the superfluid density was much lower than expected, but this was attributed to pair-breaking, disorder and phase separation. Here we report the way in which the magnetic penetration depth and the phase stiffness depend on temperature and doping by investigating the entire overdoped side of the La2-xSrxCuO4 phase diagram. We measured the absolute values of the magnetic penetration depth and the phase stiffness to an accuracy of one per cent in thousands of samples; the large statistics reveal clear trends and intrinsic properties. The films are homogeneous; variations in the critical superconducting temperature within a film are very small (less than one kelvin). At every level of doping the phase stiffness decreases linearly with temperature. The dependence of the zero-temperature phase stiffness on the critical superconducting temperature is generally linear, but with an offset; however, close to the origin this dependence becomes parabolic. In conclusion, this scaling law is incompatible with the standard BCS description.},
doi = {10.1038/nature19061},
journal = {Nature (London)},
number = 7616,
volume = 536,
place = {United States},
year = {2016},
month = {8}
}

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Cited by: 31 works
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