Document Detail


Polaron physics and crossover transition in magnetite probed by pressure-dependent infrared spectroscopy.
MedLine Citation:
PMID:  23221151     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The optical properties of magnetite at room temperature were studied by infrared reflectivity measurements as a function of pressure up to 8 GPa. The optical conductivity spectrum consists of a Drude term, two sharp phonon modes, a far-infrared band at around 600 cm(-1) and a pronounced mid-infrared absorption band. With increasing pressure both absorption bands shift to lower frequencies and the phonon modes harden in a linear fashion. Based on the shape of the MIR band, the temperature dependence of the dc transport data, and the occurrence of the far-infrared band in the optical conductivity spectrum, the polaronic coupling strength in magnetite at room temperature should be classified as intermediate. For the lower energy phonon mode an abrupt increase of the linear pressure coefficient occurs at around 6 GPa, which could be attributed to minor alterations of the charge distribution among the different Fe sites.
Authors:
J Ebad-Allah; L Baldassarre; M Sing; R Claessen; V A M Brabers; C A Kuntscher
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-10
Journal Detail:
Title:  Journal of physics. Condensed matter : an Institute of Physics journal     Volume:  25     ISSN:  1361-648X     ISO Abbreviation:  J Phys Condens Matter     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  035602     Citation Subset:  -    
Affiliation:
Experimentalphysik 2, Universität Augsburg, D-86135 Augsburg, Germany.
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