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Title: Search for ferromagnetic order in overdoped copper-oxide superconductors

Abstract

In copper-oxides that show high-temperature superconductivity (HTS), the critical temperature (Tc) has a dome-shaped doping dependence. The cause of demise of both Tc and superfluid density ns on the overdoped side is a major puzzle. A recent study of transport and diamagnetism in a large number of overdoped La2-xSrxCuO4 (LSCO) films shows that this cannot be accounted for by disorder within the conventional Bardeen-Cooper-Schrieffer theory. This brings to focus an alternative explanation — competition of HTS with ferromagnetic order, fluctuating in superconducting samples and static beyond the superconductor-to-metal transition. Here, we examine this proposal by growing single-crystal LSCO thin films with doping on both sides of the transition by molecular beam epitaxy, and using polarized neutron reflectometry to measure their magnetic moments. In a heavily overdoped, metallic but non-superconducting LSCO (x = 0.35) film, the spin asymmetry of reflectivity shows a very small static magnetic moment (~2 emu/cm3). Less-doped, superconducting LSCO films show no magnetic moment in neutron reflectivity, both above and below Tc. Therefore, the collapse of HTS with overdoping is not caused by competing ferromagnetic order.

Authors:
 [1];  [2];  [3];  [4];  [5]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instrument and Source Division
  4. Yale Univ., New Haven, CT (United States). Applied Physics Dept.
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States). Applied Physics Dept.
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:
1351721
Report Number(s):
BNL-113691-2017-JA
Journal ID: ISSN 2045-2322; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:  
SC0012704; GBMF4410
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wu, J., Lauter, V., Ambaye, H., He, X., and Božović, I.. Search for ferromagnetic order in overdoped copper-oxide superconductors. United States: N. p., 2017. Web. https://doi.org/10.1038/srep45896.
Wu, J., Lauter, V., Ambaye, H., He, X., & Božović, I.. Search for ferromagnetic order in overdoped copper-oxide superconductors. United States. https://doi.org/10.1038/srep45896
Wu, J., Lauter, V., Ambaye, H., He, X., and Božović, I.. Wed . "Search for ferromagnetic order in overdoped copper-oxide superconductors". United States. https://doi.org/10.1038/srep45896. https://www.osti.gov/servlets/purl/1351721.
@article{osti_1351721,
title = {Search for ferromagnetic order in overdoped copper-oxide superconductors},
author = {Wu, J. and Lauter, V. and Ambaye, H. and He, X. and Božović, I.},
abstractNote = {In copper-oxides that show high-temperature superconductivity (HTS), the critical temperature (Tc) has a dome-shaped doping dependence. The cause of demise of both Tc and superfluid density ns on the overdoped side is a major puzzle. A recent study of transport and diamagnetism in a large number of overdoped La2-xSrxCuO4 (LSCO) films shows that this cannot be accounted for by disorder within the conventional Bardeen-Cooper-Schrieffer theory. This brings to focus an alternative explanation — competition of HTS with ferromagnetic order, fluctuating in superconducting samples and static beyond the superconductor-to-metal transition. Here, we examine this proposal by growing single-crystal LSCO thin films with doping on both sides of the transition by molecular beam epitaxy, and using polarized neutron reflectometry to measure their magnetic moments. In a heavily overdoped, metallic but non-superconducting LSCO (x = 0.35) film, the spin asymmetry of reflectivity shows a very small static magnetic moment (~2 emu/cm3). Less-doped, superconducting LSCO films show no magnetic moment in neutron reflectivity, both above and below Tc. Therefore, the collapse of HTS with overdoping is not caused by competing ferromagnetic order.},
doi = {10.1038/srep45896},
journal = {Scientific Reports},
number = ,
volume = 7,
place = {United States},
year = {2017},
month = {4}
}

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