High-resolution photoemission study of low-Tc superconductors

Phonon-induced electronic structures in low-Tc superconductors and comparison with the results of high-Tc cuprates

Takayoshi Yokoya, A. Chainani, T. Kiss, S. Shin, K. Hirata, N. Kameda, T. Tamegai, T. Nishio, H. Uwe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Recent advances in the energy resolution and cryogenic techniques used in photoemission spectroscopy have enabled us to directly observe the superconducting electronic structure of superconductors with a relatively lower transition temperature (low-Tc). In this paper, we report photoemission results on low-Tc superconductors measured with an ultrahigh-resolution low-temperature photoemission spectrometer. The result of Nb3Al exhibits a superconducting gap and a phonon-induced peak-dip-hump structure characteristic of the strong-coupling superconducting spectral function. From measurements of Ba0.67K0.33BiO3, we observe isotropic s-wave superconducting gap opening below Tc as well as depletion of intensity near the Fermi level above Tc, which can be attributed to a phonon-induced pseudogap. We will compare these photoemission results with those of high-Tc superconductors.

Original languageEnglish
Pages (from-to)97-101
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume378-381
Issue numberPART 1
DOIs
Publication statusPublished - Oct 1 2002
Externally publishedYes

Fingerprint

Photoemission
cuprates
Superconducting materials
Electronic structure
photoelectric emission
electronic structure
high resolution
Photoelectron spectroscopy
Fermi level
Cryogenics
Superconducting transition temperature
Spectrometers
cryogenics
depletion
transition temperature
spectrometers
spectroscopy
Temperature
energy

Keywords

  • Photoemission spectroscopy
  • Pseudogap
  • Superconducting gap

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

High-resolution photoemission study of low-Tc superconductors : Phonon-induced electronic structures in low-Tc superconductors and comparison with the results of high-Tc cuprates. / Yokoya, Takayoshi; Chainani, A.; Kiss, T.; Shin, S.; Hirata, K.; Kameda, N.; Tamegai, T.; Nishio, T.; Uwe, H.

In: Physica C: Superconductivity and its Applications, Vol. 378-381, No. PART 1, 01.10.2002, p. 97-101.

Research output: Contribution to journalArticle

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AU - Shin, S.

AU - Hirata, K.

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