Structural and magnetic states in layered manganites: An expanding view of the phase diagram Metadata

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Title

  • Main Title Structural and magnetic states in layered manganites: An expanding view of the phase diagram

Creator

  • Author: Mitchell, J. F.
    Creator Type: Personal
  • Author: Millburn, J. E.
    Creator Type: Personal
  • Author: Ling, C.
    Creator Type: Personal
  • Author: Argyriou, D. N.
    Creator Type: Personal
  • Author: Bordallo, H. N.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)

Publisher

  • Name: Argonne National Laboratory
    Place of Publication: Illinois
    Additional Info: Argonne National Lab., IL (United States)

Date

  • Creation: 2000-01-05

Language

  • English

Description

  • Content Description: Colossal magnetoresistive (CMR) manganites display a spectacular range of structural, magnetic, and electronic phases as a function of hole concentration, temperature, magnetic field, etc. A1though the bulk of research has concentrated on the 3-D perovskite manganites, the ability to study anisotropic magnetic and electronic interactions made available in reduced dimensions has accelerated interest in the layered Ruddlesden-Popper (R-P) phases of the manganite class. The quest for understanding the coupling among lattice, spin, and electronic degrees of freedom (and dimensionality) is driven by the availability of high quality materials. In this talk, the authors will present recent results on synthesis and magnetic properties of layered manganites from the La{sub 2{minus}2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} series in the Mn{sup 4+}-rich regime x >0.5. This region of the composition diagram is populated by antiferromagnetic structures that evolve from the A-type layered order to G-type ''rocksalt'' order as x increases. Between these two regimes is a wide region (0.7 < x < 0.9) where an incommensurate magnetic structure is observed. The IC structure joins spin canting and phase separation as a mode for mixed-valent manganites to accommodate FM/AF competition. Transport in these materials is dominated by highly insulating behavior, although a region close to x = 0.5 exhibits metal-nonmetal transitions and an extreme sensitivity to oxygen content. They suggest two possible explanations for this transport behavior at doping just above x = O.5: localization by oxygen defects or charge ordering of Mn{sup 3+}/Mn{sup 4+}sites.
  • Physical Description: Medium: P; Size: vp.

Subject

  • Keyword: Magnetoresistance
  • Keyword: Magnetic Properties
  • Keyword: Manganese Oxides
  • Keyword: Crystal Structure
  • Keyword: Strontium Oxides
  • STI Subject Categories: 36 Materials Science
  • Keyword: Lanthanum Oxides
  • Keyword: Synthesis

Source

  • Conference: MRS '99 Fall Meeting, Boston, MA (US), 11/29/1999--12/03/1999

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: ANL/MSD/CP-99568
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 751837
  • Archival Resource Key: ark:/67531/metadc703211

Note

  • Display Note: INIS; OSTI as DE00751837