Document Detail

Observation of a pressure-induced As-As hybridization associated with a change in the electronic state of Fe in the tetragonal phase of EuFe(2)As(2).
MedLine Citation:
PMID:  23209081     Owner:  NLM     Status:  Publisher    
The electronic and vibrational properties of EuFe(2)As(2) in the tetragonal phase between 0 and 5 GPa have been investigated using (57)Fe Mössbauer spectroscopy and (57)Fe nuclear resonance inelastic scattering, respectively. We find a discontinuous increase of the center shift around 2.3 GPa, reflecting a change of the electronic state of Fe, and above 2.5 GPa a softening of the optical phonon modes associated with an increase of the relative volume of the FeAs(4) tetrahedron in the unit cell. Our findings reveal that an effective As-As hybridization along the c axis appears at approximately 2.3 GPa in the tetragonal phase of EuFe(2)As(2), along with a change in the electronic state of Fe, causing bulk superconductivity to appear at a low temperature. Consequently, the change in the electronic state of the Fe atom and the effective As-As hybridization play key roles in the pressure-induced superconductivity in the tetragonal phase of AFe(2)As(2).
Hisao Kobayashi; Shugo Ikeda; Yui Sakaguchi; Yoshitaka Yoda; Hiroki Nakamura; Masahiko Machida
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-04
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:  2012-12-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101165248     Medline TA:  J Phys Condens Matter     Country:  -    
Other Details:
Languages:  ENG     Pagination:  022201     Citation Subset:  -    
Graduate School of Material Science, University of Hyogo, 3-2-1 Koto Hyogo 678-1297, Japan. JST, CREST, Kawaguchi, Saitama 332-0012, Japan. JST, TRIP, Chiyoda, Tokyo 102-0075, Japan.
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