Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.176402
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [18204030, 19014001, 18651075]
- Grants-in-Aid for Scientific Research [19014001, 18204030, 18651075, 19051001] Funding Source: KAKEN
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The absolute density of states of isostructural Ba24Si100 and Ba24Ge100 near the Fermi level, which is very relevant for discussion on phonon-mediated superconductivity, is quantitatively evaluated to be 0.28 states eV(-1)/Ge atom and 0: 18 states eV(-1)/Si atom by combining soft x-ray photoelectron spectroscopy and magnetic susceptibility measurements. The energetics of the anharmonic motions of the endohedral Ba atoms are also discussed on the basis of the 4d-core-level spectra. The discussion based on these important physical parameters concludes that the unique electron-phonon interactions do not occur due to the local Jahn-Teller distortion of the fragile open cage structure in the phonon-mediated BCS formalism. Compounds with a rigid cage would be essential to give rise to anticipated unique interactions as a key ingredient favored for superconducting paring.
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