Document Detail

Gate-tunable polarized phase of two-dimensional electrons at the LaAlO3/SrTiO3 interface.
MedLine Citation:
PMID:  23708121     Owner:  NLM     Status:  MEDLINE    
Controlling the coupling between localized spins and itinerant electrons can lead to exotic magnetic states. A novel system featuring local magnetic moments and extended 2D electrons is the interface between LaAlO3 and SrTiO3. The magnetism of the interface, however, was observed to be insensitive to the presence of these electrons and is believed to arise solely from extrinsic sources like oxygen vacancies and strain. Here we show the existence of unconventional electronic phases in the LaAlO3/SrTiO3 system pointing to an underlying tunable coupling between itinerant electrons and localized moments. Using anisotropic magnetoresistance and anomalous Hall effect measurements in a unique in-plane configuration, we identify two distinct phases in the space of carrier density and magnetic field. At high densities and fields, the electronic system is strongly polarized and shows a response, which is highly anisotropic along the crystalline directions. Surprisingly, below a density-dependent critical field, the polarization and anisotropy vanish whereas the resistivity sharply rises. The unprecedented vanishing of the easy axes below a critical field is in sharp contrast with other coupled magnetic systems and indicates strong coupling with the moments that depends on the symmetry of the itinerant electrons. The observed interplay between the two phases indicates the nature of magnetism at the LaAlO3/SrTiO3 interface as both having an intrinsic origin and being tunable.
Arjun Joshua; Jonathan Ruhman; Sharon Pecker; Ehud Altman; Shahal Ilani
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2013-05-24
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  110     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2013 Jun 
Date Detail:
Created Date:  2013-06-12     Completed Date:  2013-08-23     Revised Date:  2013-12-12    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9633-8     Citation Subset:  IM    
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MeSH Terms
Magnetic Fields
Models, Chemical
Oxides / chemistry*
Strontium / chemistry*
Titanium / chemistry*
Reg. No./Substance:
0/Oxides; 12060-59-2/strontium titanium oxide; 6I3K30563S/Lanthanum; CPD4NFA903/Aluminum; D1JT611TNE/Titanium; YZS2RPE8LE/Strontium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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