期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 25, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/25/2/022201
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资金
- Grants-in-Aid for Scientific Research [23102723] Funding Source: KAKEN
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).
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