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Title: Role of oxygen vacancies in magnetic properties of LaAlO{sub 3}/SrTiO{sub 3} interface

The interface of two band-insulators SrTiO{sub 3} and LaAlO{sub 3} exhibits a highly conducting two-dimensional electron gas which shows low-temperature superconductivity, ferromagnetism and many other novel properties. Several studies reveal that the oxygen vacancies at the interface have strong influence on the electronic and magnetic properties of the interface electrons. Here, we develop an insight into the effects of oxygen vacancies on the magnetic properties of the system; the oxygen vacancies help in establishing ferromagnetism which competes with superconductivity at low temperatures. Simulated Monte-Carlo annealing suggests an ordering of the oxygen vacant sites and sheds light on the experimental observation of the quenching of magnetic moment on annealing. A possible explanation for the coexistence of superconductivity and ferromagnetism is also discussed.
Authors:
 [1] ;  [2]
  1. Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, West Bengal-721302 (India)
  2. Department of Physics and Meteorology, Indian Institute of Technology Kharagpur, West Bengal-721302, India and Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, West Bengal-721302 (India)
Publication Date:
OSTI Identifier:
22269349
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; ANNEALING; ELECTRON GAS; FERROMAGNETISM; INTERFACES; LANTHANUM COMPOUNDS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MONTE CARLO METHOD; OXYGEN; QUENCHING; SIMULATION; STRONTIUM TITANATES; SUPERCONDUCTIVITY