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The authors report on colossal electroresistance (ER) in the ferromagnetic insulator manganite La0.9Sr0.1MnO3. The single crystal samples exhibit a transition into a low resistive state above a certai...
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Signatures of enhanced ordering temperatures in digital superlattices of (LaMnO3)m/(SrMnO3)2m

Appl. Phys. Lett. 90, 222503 (2007); doi:10.1063/1.2745205

Published 31 May 2007

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A. Bhattacharya
Center for Nanoscale Materials and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

X. Zhai, M. Warusawithana, and J. N. Eckstein
Department of Physics, University of Illinois at Urbana-Champaign, Illinois 61801

S. D. Bader
Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
Digital superlattices of (LaMnO3)m/SrMnO3)2m (m<=3) having the same nominal composition as La1/3Sr2/3MnO3, an antiferromagnetic insulator, have been synthesized by means of molecular beam epitaxy. All superlattices show a sharp resistive maximum at temperatures near to or higher than the Néel temperature of bulk La1/3Sr2/3MnO3. No discernible signatures of magnetic ordering are observed near the resistivity peak for m<=2, but m=3 has a susceptibility peak consistent with antiferromagnet ordering, which is canted when cooled in a small magnetic field. Analogies are drawn to dx2−y2 orbitally ordered, layered antiferromagnetic manganites to explain the observations. ©2007 American Institute of Physics
History: Received 25 March 2007; accepted 7 May 2007; published 31 May 2007
Permalink: http://link.aip.org/link/?APPLAB/90/222503/1
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KEYWORDS and PACS

Keywords
PACS
  • 75.70.Cn
    Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
  • 75.50.Ee
    Antiferromagnetics
  • 75.30.Kz
    Magnetic phase boundaries including magnetic transitions, metamagnetism, etc
  • 75.30.Cr
    Saturation moments and magnetic susceptibilities in magnetically ordered materials
  • 75.40.Cx
    Static properties of magnetic materials including order parameter, static susceptibility, heat capacities, critical exponents, etc
  • 73.63.-b
    Electronic transport in nanoscale materials and structures
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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