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Title: Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state

Abstract

The crystal structure of the layered perovskite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} has been studied under hydrostatic pressure up to {approximately} 6 kbar, in the paramagnetic and ferromagnetic states, with neutron powder diffraction. The compressibility of the Mn-O apical bonds in the double layer of MnO{sub 6} octahedra changes sign from the paramagnetic insulator (PI) to the ferromagnetic metal (FM) state; in the Fm state the Mn-O-Mn linkage between MnO{sub 2} planes expands under applied pressure, whereas they contract in the PI state. This counterintuative behavior is interpreted in terms of exchange striction, which reflect the competition between super- and double-exchange. An increase of the Mn-moment with applied pressure in the FM state is consistent with a positive dT{sub C}/dP, as well as a cant angle {theta}{sub 0} between the magnetizations of neighboring MnO{sub 2} sheets that decreases with pressure.

Authors:
; ; ; ;  [1];  [2]
  1. Argonne National Lab., IL (United States)
  2. Univ. of Texas, Austin, TX (United States). Center for Material Science and Engineering
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States); National Science Foundation, Washington, DC (United States); Welch (Robert A.) Foundation, Houston, TX (United States)
OSTI Identifier:
521660
Report Number(s):
ANL/MSD/CP-91963; CONF-9703106-1
ON: DE97007006; CNN: Grant NSF DMR 91-20000; TRN: 97:018424
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: American Physical Society meeting, Kansas City, MO (United States), 17-21 Mar 1997; Other Information: PBD: Mar 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRYSTAL STRUCTURE; LANTHANUM OXIDES; STRONTIUM OXIDES; MANGANESE OXIDES; PHYSICAL PROPERTIES; PRESSURE DEPENDENCE; CURIE POINT; CHEMICAL BONDS; TEMPERATURE DEPENDENCE

Citation Formats

Argyriou, D.N., Mitchell, J.F., Chmaissem, O., Short, S., Jorgensen, J.D., and Goodenough, J.B.. Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state. United States: N. p., 1997. Web.
Argyriou, D.N., Mitchell, J.F., Chmaissem, O., Short, S., Jorgensen, J.D., & Goodenough, J.B.. Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state. United States.
Argyriou, D.N., Mitchell, J.F., Chmaissem, O., Short, S., Jorgensen, J.D., and Goodenough, J.B.. Sat . "Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state". United States. doi:. https://www.osti.gov/servlets/purl/521660.
@article{osti_521660,
title = {Sign reversal of the MN-O bond compressibility in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} below T{sub C}: Exchange striction in the ferromagnetic state},
author = {Argyriou, D.N. and Mitchell, J.F. and Chmaissem, O. and Short, S. and Jorgensen, J.D. and Goodenough, J.B.},
abstractNote = {The crystal structure of the layered perovskite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} has been studied under hydrostatic pressure up to {approximately} 6 kbar, in the paramagnetic and ferromagnetic states, with neutron powder diffraction. The compressibility of the Mn-O apical bonds in the double layer of MnO{sub 6} octahedra changes sign from the paramagnetic insulator (PI) to the ferromagnetic metal (FM) state; in the Fm state the Mn-O-Mn linkage between MnO{sub 2} planes expands under applied pressure, whereas they contract in the PI state. This counterintuative behavior is interpreted in terms of exchange striction, which reflect the competition between super- and double-exchange. An increase of the Mn-moment with applied pressure in the FM state is consistent with a positive dT{sub C}/dP, as well as a cant angle {theta}{sub 0} between the magnetizations of neighboring MnO{sub 2} sheets that decreases with pressure.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Mar 01 00:00:00 EST 1997},
month = {Sat Mar 01 00:00:00 EST 1997}
}

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