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Title: Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides

The so-called proximity effect is the manifestation, across an interface, of the systematic competition between magnetic order and superconductivity. This phenomenon has been well documented and understood for conventional superconductors coupled with metallic ferromagnets; however it is still less known for oxide materials, where much higher critical temperatures are offered by copper oxide-based superconductors. In this paper, we show that, even in the absence of direct Cu–O–Mn covalent bonding, the interfacial CuO 2 planes of superconducting La 1.85Sr 0.15CuO 4 thin films develop weak ferromagnetism associated to the charge transfer of spin-polarised electrons from the La 0.66Sr 0.33MnO 3 ferromagnet. Theoretical modelling confirms that this effect is general to all cuprate/manganite heterostructures and the presence of direct bonding only affects the strength of the coupling. Finally, the Dzyaloshinskii–Moriya interaction, also at the origin of the weak ferromagnetism of bulk cuprates, propagates the magnetisation from the interface CuO 2 planes into the superconductor, eventually depressing its critical temperature.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [1]
  1. University of Naples Federico II, Via Cinthia, Naples (Italy)
  2. Piazza Leonardo da Vinci, Milano (Italy)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  5. Univ. of Twente, Enschede (Netherlands)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1265273

De Luca, G. M., Ghiringhelli, G., Perroni, C. A., Cataudella, V., Chiarella, F., Cantoni, Claudia, Lupini, Andrew R., Brookes, N. B., Huijben, M., Koster, Gertjan, Rijnders, Guus, and Salluzzo, M.. Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides. United States: N. p., Web. doi:10.1038/ncomms6626.
De Luca, G. M., Ghiringhelli, G., Perroni, C. A., Cataudella, V., Chiarella, F., Cantoni, Claudia, Lupini, Andrew R., Brookes, N. B., Huijben, M., Koster, Gertjan, Rijnders, Guus, & Salluzzo, M.. Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides. United States. doi:10.1038/ncomms6626.
De Luca, G. M., Ghiringhelli, G., Perroni, C. A., Cataudella, V., Chiarella, F., Cantoni, Claudia, Lupini, Andrew R., Brookes, N. B., Huijben, M., Koster, Gertjan, Rijnders, Guus, and Salluzzo, M.. 2014. "Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides". United States. doi:10.1038/ncomms6626. https://www.osti.gov/servlets/purl/1265273.
@article{osti_1265273,
title = {Ubiquitous long-range antiferromagnetic coupling across the interface between superconducting and ferromagnetic oxides},
author = {De Luca, G. M. and Ghiringhelli, G. and Perroni, C. A. and Cataudella, V. and Chiarella, F. and Cantoni, Claudia and Lupini, Andrew R. and Brookes, N. B. and Huijben, M. and Koster, Gertjan and Rijnders, Guus and Salluzzo, M.},
abstractNote = {The so-called proximity effect is the manifestation, across an interface, of the systematic competition between magnetic order and superconductivity. This phenomenon has been well documented and understood for conventional superconductors coupled with metallic ferromagnets; however it is still less known for oxide materials, where much higher critical temperatures are offered by copper oxide-based superconductors. In this paper, we show that, even in the absence of direct Cu–O–Mn covalent bonding, the interfacial CuO2 planes of superconducting La1.85Sr0.15CuO4 thin films develop weak ferromagnetism associated to the charge transfer of spin-polarised electrons from the La0.66Sr0.33MnO3 ferromagnet. Theoretical modelling confirms that this effect is general to all cuprate/manganite heterostructures and the presence of direct bonding only affects the strength of the coupling. Finally, the Dzyaloshinskii–Moriya interaction, also at the origin of the weak ferromagnetism of bulk cuprates, propagates the magnetisation from the interface CuO2 planes into the superconductor, eventually depressing its critical temperature.},
doi = {10.1038/ncomms6626},
journal = {Nature Communications},
number = ,
volume = 5,
place = {United States},
year = {2014},
month = {11}
}