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Title: Lattice displacements above T[sub C] in the layered manganite La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]

Abstract

Neutron-diffraction data presented in this paper demonstrate the relevance of lattice displacement above T[sub C], in our understanding of the evolution of the crystal structure with temperature in the layered colossal magnetoresistance manganite La[sub 1.2]Sr[sub 1.8]Mn[sub 2]O[sub 7]. The anomalous temperature behavior of thermal diffuse scattering in La[sub 1.2]Sr[sub 1.8]Mn[sub 2]O[sub 7] strongly suggests that it arises from lattice displacements and correlates directly with anomalies in the displacement parameters of the O and Mn atoms and the Mn-O bond lengths. From our measurements, the insulator-metal transition can be described as a transition from a high-temperature state with disordered Mn-O bond lengths to a low-temperature state with a more uniform distribution on Mn-O bonds. These observations are in agreement with polaronic charge transport above T[sub C] in the perovskite manganites; as electron hopping is responsible for bond disorder above T[sub C], below the transition where e[sub g] carriers are delocalized, any lattice displacements are uniformly averaged. [copyright] [ital 1999] [ital The American Physical Society]

Authors:
;  [1]; ;  [2];  [3]
  1. (Manuel Lujan Jr. Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States))
  2. (Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States))
  3. (Department of Chemistry, University of California--Santa Barbara, Santa Barbara, California 93106 (United States))
Publication Date:
OSTI Identifier:
6333750
Alternate Identifier(s):
OSTI ID: 6333750
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 60:9; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BOND LENGTHS; CHARGED-PARTICLE TRANSPORT; CRYSTAL STRUCTURE; CURIE POINT; FERROMAGNETIC MATERIALS; LANTHANUM COMPOUNDS; LANTHANUM OXIDES; MAGNETORESISTANCE; MANGANESE OXIDES; ORDER-DISORDER TRANSFORMATIONS; PEROVSKITES; POLARONS; STRONTIUM COMPOUNDS; STRONTIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; DIMENSIONS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; LENGTH; MAGNETIC MATERIALS; MANGANESE COMPOUNDS; MATERIALS; MINERALS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; QUASI PARTICLES; RADIATION TRANSPORT; RARE EARTH COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE 360204* -- Ceramics, Cermets, & Refractories-- Physical Properties; 360202 -- Ceramics, Cermets, & Refractories-- Structure & Phase Studies

Citation Formats

Argyriou, D.N., Bordallo, H.N., Mitchell, J.F., Jorgensen, J.D., and Strouse, G.F. Lattice displacements above T[sub C] in the layered manganite La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.6200.
Argyriou, D.N., Bordallo, H.N., Mitchell, J.F., Jorgensen, J.D., & Strouse, G.F. Lattice displacements above T[sub C] in the layered manganite La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]. United States. doi:10.1103/PhysRevB.60.6200.
Argyriou, D.N., Bordallo, H.N., Mitchell, J.F., Jorgensen, J.D., and Strouse, G.F. Wed . "Lattice displacements above T[sub C] in the layered manganite La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]". United States. doi:10.1103/PhysRevB.60.6200.
@article{osti_6333750,
title = {Lattice displacements above T[sub C] in the layered manganite La[sub 1. 2]Sr[sub 1. 8]Mn[sub 2]O[sub 7]},
author = {Argyriou, D.N. and Bordallo, H.N. and Mitchell, J.F. and Jorgensen, J.D. and Strouse, G.F.},
abstractNote = {Neutron-diffraction data presented in this paper demonstrate the relevance of lattice displacement above T[sub C], in our understanding of the evolution of the crystal structure with temperature in the layered colossal magnetoresistance manganite La[sub 1.2]Sr[sub 1.8]Mn[sub 2]O[sub 7]. The anomalous temperature behavior of thermal diffuse scattering in La[sub 1.2]Sr[sub 1.8]Mn[sub 2]O[sub 7] strongly suggests that it arises from lattice displacements and correlates directly with anomalies in the displacement parameters of the O and Mn atoms and the Mn-O bond lengths. From our measurements, the insulator-metal transition can be described as a transition from a high-temperature state with disordered Mn-O bond lengths to a low-temperature state with a more uniform distribution on Mn-O bonds. These observations are in agreement with polaronic charge transport above T[sub C] in the perovskite manganites; as electron hopping is responsible for bond disorder above T[sub C], below the transition where e[sub g] carriers are delocalized, any lattice displacements are uniformly averaged. [copyright] [ital 1999] [ital The American Physical Society]},
doi = {10.1103/PhysRevB.60.6200},
journal = {Physical Review, B: Condensed Matter},
issn = {0163-1829},
number = ,
volume = 60:9,
place = {United States},
year = {1999},
month = {9}
}