Photoemission and inverse-photoemission study of superconducting YNi2B2C: Effects of electron-electron and electron-phonon interactions

A. Fujimori, K. Kobayashi, T. Mizokawa, K. Mamiya, A. Sekiyama, H. Eisaki, H. Takagi, S. Uchida, R. J. Cava, J. J. Krajewski, W. F. Peck

Research output: Contribution to journalArticle

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Abstract

We have studied the electronic structure of the superconductor YNi2B2C by photoemission and inverse-photoemission spectroscopy. The spectra show a prominent Ni 3d band centered around 1.5 eV below the Fermi level (EF), whose top crosses EF, and B, C 2sp-derived states at higher binding energies, generally consistent with band-structure calculations. However, the Ni 3d-derived conduction bands are narrower than calculated and are accompanied by a satellite, signaling electron-correlation effects within the d bands. The density-of-states peak at EF predicted by band-structure calculations is suppressed and its spectral weight is transferred away from EF, presumably due to an electron-phonon interaction and/or electron correlation.

Original languageEnglish (US)
Pages (from-to)9660-9663
Number of pages4
JournalPhysical Review B
Volume50
Issue number13
DOIs
StatePublished - Jan 1 1994
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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