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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 1-3, is intensely debated. The overdoped side is perceived as simpler, with strongly-correlated fermion physics evolving smoothly into the conventional Bardeen-Cooper-Schrieffer (BCS) behavior. Pioneering studies on a few overdoped samples 4-11 indicated that the superfluid density was much smaller than expected, but this was attributed to pair-breaking, disorder, and phase separation. Here, we test this conjecture by studying how the magnetic penetration depth λ and the phase stiffness ρs depend on temperature and doping, scanning densely the entire overdoped side of the La 2-xSr xCuO 4 (LSCO) phase diagram. We have measured the absolute values of λ and ρs to the accuracy of ±1% in thousands of cuprate samples; the large statistics reveals clear trends and intrinsic properties. The films are quite homogeneous; variations in the critical temperature (T c) within a film are very small (< 1 K). At every doping, ρs(T) decreases linearly with temperature. The T c(ρ s0) dependence is linear but with an offset, (T c - T 0) ∝ ρs0 where T0 ≈ 7 K, except very close to the origin where Tc ∝ √ρ s0. Thismore » scaling law defies the standard BCS description, posing a challenge to theory.« 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 Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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:
Journal Article: 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. doi: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. doi: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. doi: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 superconductivity1-3, is intensely debated. The overdoped side is perceived as simpler, with strongly-correlated fermion physics evolving smoothly into the conventional Bardeen-Cooper-Schrieffer (BCS) behavior. Pioneering studies on a few overdoped samples4-11 indicated that the superfluid density was much smaller than expected, but this was attributed to pair-breaking, disorder, and phase separation. Here, we test this conjecture by studying how the magnetic penetration depth λ and the phase stiffness ρs depend on temperature and doping, scanning densely the entire overdoped side of the La2-xSrxCuO4 (LSCO) phase diagram. We have measured the absolute values of λ and ρs to the accuracy of ±1% in thousands of cuprate samples; the large statistics reveals clear trends and intrinsic properties. The films are quite homogeneous; variations in the critical temperature (Tc) within a film are very small (< 1 K). At every doping, ρs(T) decreases linearly with temperature. The Tc(ρ s0) dependence is linear but with an offset, (Tc - T0) ∝ ρs0 where T0 ≈ 7 K, except very close to the origin where Tc ∝ √ρ s0. This scaling law defies the standard BCS description, posing a challenge to theory.},
doi = {10.1038/nature19061},
journal = {Nature (London)},
number = 7616,
volume = 536,
place = {United States},
year = {Wed Aug 17 00:00:00 EDT 2016},
month = {Wed Aug 17 00:00:00 EDT 2016}
}

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Cited by: 31works
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