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  Magnetic and superconducting phases at the LaAlO3/SrTiO3 interface: The role of interfacial Ti 3d electrons

Pavlenko, N., Kopp, T., Tsymbal, E. Y., Sawatzky, G. A., & Mannhart, J. (2012). Magnetic and superconducting phases at the LaAlO3/SrTiO3 interface: The role of interfacial Ti 3d electrons. Physical Review B, 85(2): 020407.

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 Creators:
Pavlenko, N., Author
Kopp, T., Author
Tsymbal, E. Y., Author
Sawatzky, G. A.1, 2, Author           
Mannhart, J.3, Author           
Affiliations:
1External Scientific Members, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370506              
2Miscellaneous, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370507              
3Department Solid State Quantum Electronics (Jochen Mannhart), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370485              

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 Abstract: Ferromagnetism and superconductivity are, in most cases, adverse. However, recent experiments reveal that they coexist at interfaces of LaAlO(3) and SrTiO(3). We analyze the magnetic state within density functional theory and provide evidence that magnetism is not an intrinsic property of the two-dimensional electron liquid at the interface. We demonstrate that the robust ferromagnetic state is induced by the oxygen vacancies in SrTiO(3) or in the LaAlO(3) layer. This allows for the notion that areas with increased density of oxygen vacancies produce ferromagnetic puddles and account for the previous observation of a superparamagnetic behavior in the superconducting state.

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Language(s): eng - English
 Dates: 2012
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 582106
ISI: 000299270800001
 Degree: -

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Title: Physical Review B
  Alternative Title : Phys. Rev. B
Source Genre: Journal
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Publ. Info: COLLEGE PK : AMER PHYSICAL SOC
Pages: - Volume / Issue: 85 (2) Sequence Number: 020407 Start / End Page: - Identifier: ISSN: 1098-0121