Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters
Abstract
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.
- Authors:
-
- Institut de Ciencia de Materials de Barcelona, Barcelona (Spain)
- 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)
- Escola Univ. Salesiana de Sarria, Barcelona (Spain)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. Complutense de Madrid, Madrid (Spain)
- Univ. de Zaragoza, Zaragoza (Spain)
- ALBA Synchrotron Light Source, Cerdanyola del Valles (Spain)
- Univ. of Singapore, (Singapore)
- Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Vanderbilt Univ., Nashville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1461628
- Alternate Identifier(s):
- OSTI ID: 1597768
- Grant/Contract Number:
- FG02-09ER46554; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Advanced Science
- Additional Journal Information:
- Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2198-3844
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; magnetism; nanostructures; STEM-EELS; superconductivity; XMCD
Citation Formats
Gazquez, Jaume, Guzman, Roger., Mishra, Rohan, Bartolome, Elena, Salafranca, Juan, Magen, Cesar, Varela, Maria, Coll, Mariona, Palau, Anna, Valvidares, S. Manuel, Gargiani, Pierluigi, Pellegrin, Eric, Herrero-Martin, Javier, Pennycook, Stephen J., Pantelides, Sokrates T., Puig, Teresa, and Obradors, Xavier. Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters. United States: N. p., 2016.
Web. doi:10.1002/advs.201500295.
Gazquez, Jaume, Guzman, Roger., Mishra, Rohan, Bartolome, Elena, Salafranca, Juan, Magen, Cesar, Varela, Maria, Coll, Mariona, Palau, Anna, Valvidares, S. Manuel, Gargiani, Pierluigi, Pellegrin, Eric, Herrero-Martin, Javier, Pennycook, Stephen J., Pantelides, Sokrates T., Puig, Teresa, & Obradors, Xavier. Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters. United States. https://doi.org/10.1002/advs.201500295
Gazquez, Jaume, Guzman, Roger., Mishra, Rohan, Bartolome, Elena, Salafranca, Juan, Magen, Cesar, Varela, Maria, Coll, Mariona, Palau, Anna, Valvidares, S. Manuel, Gargiani, Pierluigi, Pellegrin, Eric, Herrero-Martin, Javier, Pennycook, Stephen J., Pantelides, Sokrates T., Puig, Teresa, and Obradors, Xavier. Tue .
"Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters". United States. https://doi.org/10.1002/advs.201500295. https://www.osti.gov/servlets/purl/1461628.
@article{osti_1461628,
title = {Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters},
author = {Gazquez, Jaume and Guzman, Roger. and Mishra, Rohan and Bartolome, Elena and Salafranca, Juan and Magen, Cesar and Varela, Maria and Coll, Mariona and Palau, Anna and Valvidares, S. Manuel and Gargiani, Pierluigi and Pellegrin, Eric and Herrero-Martin, Javier and Pennycook, Stephen J. and Pantelides, Sokrates T. and Puig, Teresa and Obradors, Xavier},
abstractNote = {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.},
doi = {10.1002/advs.201500295},
journal = {Advanced Science},
number = 6,
volume = 3,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2016},
month = {Tue Mar 15 00:00:00 EDT 2016}
}
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