Ultra-high resolution photoemission spectroscopy of simple metals: Direct observation of superconducting gap and phonon-induced fine structures

T. Kiss, Takayoshi Yokoya, A. Chainani, S. Shin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have performed ultra-high resolution photoemission spectroscopy of simple metals, Nb (Tc = 9.26 K) and Pb (Tc = 7.19 K) in order to study the changes in the density of states across the transition temperatures. The spectra of both compounds measured at 5.3 K show an opening of the superconducting gap accompanied by a leading-edge shift and an appearance of a sharp peak just below the Fermi level. Furthermore, the Pb spectrum clearly shows peak-dip-hump structures due to strong electron-phonon coupling, as seen in the high-Tc cuprates. This makes it a characteristic of strong-coupling superconductivity.

Original languageEnglish
Pages (from-to)635-639
Number of pages5
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume114-116
DOIs
Publication statusPublished - Mar 2001
Externally publishedYes

Fingerprint

Photoelectron spectroscopy
Superconductivity
Fermi level
Superconducting transition temperature
photoelectric emission
Metals
fine structure
Electrons
high resolution
leading edges
metals
spectroscopy
cuprates
superconductivity
transition temperature
shift
electrons

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

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T1 - Ultra-high resolution photoemission spectroscopy of simple metals

T2 - Direct observation of superconducting gap and phonon-induced fine structures

AU - Kiss, T.

AU - Yokoya, Takayoshi

AU - Chainani, A.

AU - Shin, S.

PY - 2001/3

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AB - We have performed ultra-high resolution photoemission spectroscopy of simple metals, Nb (Tc = 9.26 K) and Pb (Tc = 7.19 K) in order to study the changes in the density of states across the transition temperatures. The spectra of both compounds measured at 5.3 K show an opening of the superconducting gap accompanied by a leading-edge shift and an appearance of a sharp peak just below the Fermi level. Furthermore, the Pb spectrum clearly shows peak-dip-hump structures due to strong electron-phonon coupling, as seen in the high-Tc cuprates. This makes it a characteristic of strong-coupling superconductivity.

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