2013年1月
Observation of a pressure-induced As-As hybridization associated with a change in the electronic state of Fe in the tetragonal phase of EuFe2As2
JOURNAL OF PHYSICS-CONDENSED MATTER
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- 巻
- 25
- 号
- 2
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/0953-8984/25/2/022201
- 出版者・発行元
- IOP PUBLISHING LTD
The electronic and vibrational properties of EuFe2As2 in the tetragonal phase between 0 and 5 GPa have been investigated using Fe-57 Mossbauer spectroscopy and Fe-57 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 FeAs4 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 EuFe2As2, 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-nduced superconductivity in the tetragonal phase of AFe(2)As(2).
- リンク情報
- ID情報
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- DOI : 10.1088/0953-8984/25/2/022201
- ISSN : 0953-8984
- Web of Science ID : WOS:000312106700001