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

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms6626· OSTI ID:1265273
 [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)
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265273
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 5; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Design of Complex Oxide Interfaces by Oxide Molecular Beam Epitaxy journal October 2019
Proximity effects across oxide-interfaces of superconductor-insulator-ferromagnet hybrid heterostructure journal February 2018

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