Charge Melting and Polaron Collapse in La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7}

Journal Article · Mon Nov 22 04:00:00 EST 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.4393· OSTI ID:20217971

Vasiliu-Doloc, L ^[1]; Rosenkranz, S ^[2]; Osborn, R ^[2]; Sinha, S K ^[2]; Lynn, J W ^[1]; Mesot, J ^[2]; Seeck, O H ^[2]; Preosti, G ^[2]; Fedro, A J ^[3]; Mitchell, J F ^[2]

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1. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 (United States)

X-ray and neutron scattering measurements directly demonstrate the existence of polarons in the paramagnetic phase of optimally doped colossal magnetoresistive oxides. The polarons exhibit short-range correlations that grow with decreasing temperature, but disappear abruptly at the ferromagnetic transition because of the sudden charge delocalization. The ''melting'' of the charge ordering as we cool through T{sub C} occurs with the collapse of the quasistatic polaron scattering, and provides important new insights into the relation of polarons to colossal magnetoresistance. (c) 1999 The American Physical Society.

• OSTI ID: 20217971
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADVANCED PHOTON SOURCE
CORRELATIONS
EXPERIMENTAL DATA
FERROMAGNETISM
LANTHANUM OXIDES
MANGANESE OXIDES
NEUTRON DIFFRACTION
POLARONS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION