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Title: Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters

Journal Article · · Advanced Science
 [1];  [1];  [2];  [3];  [4];  [5];  [4];  [1];  [1];  [6];  [6];  [6];  [6];  [7];  [8];  [1];  [1]
  1. Institut de Ciencia de Materials de Barcelona, Barcelona (Spain)
  2. Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Washington Univ. St. Louis, St. Louis, MO (United States)
  3. Escola Univ. Salesiana de Sarria, Barcelona (Spain)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. Complutense de Madrid, Madrid (Spain)
  5. Univ. de Zaragoza, Zaragoza (Spain)
  6. ALBA Synchrotron Light Source, Cerdanyola del Valles (Spain)
  7. Univ. of Singapore, (Singapore)
  8. Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, defects in ceramic materials are generally seen as detrimental to their functionality and applicability. Yet, in some complex oxides, defects present an opportunity to enhance some of their properties or even lead to the discovery of exciting physics, particularly in the presence of strong correlations. A paradigmatic case is the high–temperature superconductor YBa2Cu3O7–δ (Y123), in which nanoscale defects play an important role as they can immobilize quantized magnetic flux vortices. Here previously unforeseen point defects buried in Y123 thin films that lead to the formation of ferromagnetic clusters embedded within the superconductor are unveiled. Aberration–corrected scanning transmission microscopy has been used for exploring, on a single unit–cell level, the structure and chemistry resulting from these complex point defects, along with density functional theory calculations, for providing new insights about their nature including an unexpected defect–driven ferromagnetism, and X–ray magnetic circular dichroism for bearing evidence of Cu magnetic moments that align ferromagnetically even below the superconducting critical temperature to form a dilute system of magnetic clusters associated with the point defects.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-09ER46554; AC02-05CH11231
OSTI ID:
1461628
Alternate ID(s):
OSTI ID: 1597768
Journal Information:
Advanced Science, Vol. 3, Issue 6; ISSN 2198-3844
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

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Cited By (8)

Atomic Structure and Electrical Activity of Grain Boundaries and Ruddlesden-Popper Faults in Cesium Lead Bromide Perovskite journal December 2018
Accelerated growth by flash heating of high critical current trifluoroacetate solution derived epitaxial superconducting YBa 2 Cu 3 O 7 films journal January 2019
Disentangling vortex pinning landscape in chemical solution deposited superconducting YBa 2 Cu 3 O 7−x films and nanocomposites journal February 2018
Epitaxial YBa 2 Cu 3 O 7− x nanocomposite films and coated conductors from Ba M O 3 ( M = Zr, Hf) colloidal solutions journal February 2018
Microwave-assisted synthesis and critical analysis for YBa 2 Cu 3 O 6+ δ nanoparticles journal March 2018
Growth of all-chemical high critical current YBa 2 Cu 3 O 7− δ thick films and coated conductors journal November 2018
Controlling the strength of ferromagnetic order in YB a 2 C u 3 O 7 / L a 2 / 3 C a 1 / 3 Mn O 3 multilayers journal September 2019
Direct observation of apical oxygen vacancies in the high-temperature superconductor YB a 2 C u 3 O 7 x journal November 2019

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