Surface electronic structure of the organic superconductor κ-(ET)2Cu(NCS)2 studied via photoemission microscopy

James E. Downes; Kevin E. Smith; A. Y. Matsuura; Ingolf Lindau; John A. Schlueter

doi:10.1016/j.susc.2003.12.050

Surface electronic structure of the organic superconductor κ-(ET)2Cu(NCS)2 studied via photoemission microscopy

James E. Downes, Kevin E. Smith^*, A. Y. Matsuura, Ingolf Lindau, John A. Schlueter

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The surface electronic structure of cleaved single crystals of the organic superconductor κ-(ET)₂Cu(NCS)₂ has been studied using photoemission microscopy. Two types of cleaved surfaces were observed, displaying different valence band photoemission spectra and different spectral behavior near the Fermi level, E_F. In particular, spectra from one surface type display relatively broad spectral features in the valence band and finite spectral intensity at E_F, while spectra from the other surface type show well-defined valence band emission features and zero photoemission intensity at E_F. We propose that the spectral differences are due to a very short electron mean free path in this material, and our results are used to explain the differences between previously published photoemission spectra from this superconductor. We also report the results of an investigation of the electronic structure of defects in this material.

Original language	English
Pages (from-to)	219-227
Number of pages	9
Journal	Surface Science
Volume	551
Issue number	3
DOIs	https://doi.org/10.1016/j.susc.2003.12.050
Publication status	Published - 1 Mar 2004
Externally published	Yes

Keywords

Insulating surfaces
Metallic surfaces
Radiation damage
Single crystal surfaces
Superconducting surfaces
Surface defects
Synchrotron radiation photoelectron spectroscopy

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10.1016/j.susc.2003.12.050

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title = "Surface electronic structure of the organic superconductor κ-(ET)2Cu(NCS)2 studied via photoemission microscopy",

abstract = "The surface electronic structure of cleaved single crystals of the organic superconductor κ-(ET)2Cu(NCS)2 has been studied using photoemission microscopy. Two types of cleaved surfaces were observed, displaying different valence band photoemission spectra and different spectral behavior near the Fermi level, EF. In particular, spectra from one surface type display relatively broad spectral features in the valence band and finite spectral intensity at EF, while spectra from the other surface type show well-defined valence band emission features and zero photoemission intensity at EF. We propose that the spectral differences are due to a very short electron mean free path in this material, and our results are used to explain the differences between previously published photoemission spectra from this superconductor. We also report the results of an investigation of the electronic structure of defects in this material.",

keywords = "Insulating surfaces, Metallic surfaces, Radiation damage, Single crystal surfaces, Superconducting surfaces, Surface defects, Synchrotron radiation photoelectron spectroscopy",

author = "Downes, {James E.} and Smith, {Kevin E.} and Matsuura, {A. Y.} and Ingolf Lindau and Schlueter, {John A.}",

year = "2004",

month = mar,

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doi = "10.1016/j.susc.2003.12.050",

language = "English",

volume = "551",

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journal = "Surface Science",

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publisher = "Elsevier",

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TY - JOUR

T1 - Surface electronic structure of the organic superconductor κ-(ET)2Cu(NCS)2 studied via photoemission microscopy

AU - Downes, James E.

AU - Smith, Kevin E.

AU - Matsuura, A. Y.

AU - Lindau, Ingolf

AU - Schlueter, John A.

PY - 2004/3/1

Y1 - 2004/3/1

N2 - The surface electronic structure of cleaved single crystals of the organic superconductor κ-(ET)2Cu(NCS)2 has been studied using photoemission microscopy. Two types of cleaved surfaces were observed, displaying different valence band photoemission spectra and different spectral behavior near the Fermi level, EF. In particular, spectra from one surface type display relatively broad spectral features in the valence band and finite spectral intensity at EF, while spectra from the other surface type show well-defined valence band emission features and zero photoemission intensity at EF. We propose that the spectral differences are due to a very short electron mean free path in this material, and our results are used to explain the differences between previously published photoemission spectra from this superconductor. We also report the results of an investigation of the electronic structure of defects in this material.

AB - The surface electronic structure of cleaved single crystals of the organic superconductor κ-(ET)2Cu(NCS)2 has been studied using photoemission microscopy. Two types of cleaved surfaces were observed, displaying different valence band photoemission spectra and different spectral behavior near the Fermi level, EF. In particular, spectra from one surface type display relatively broad spectral features in the valence band and finite spectral intensity at EF, while spectra from the other surface type show well-defined valence band emission features and zero photoemission intensity at EF. We propose that the spectral differences are due to a very short electron mean free path in this material, and our results are used to explain the differences between previously published photoemission spectra from this superconductor. We also report the results of an investigation of the electronic structure of defects in this material.

KW - Insulating surfaces

KW - Metallic surfaces

KW - Radiation damage

KW - Single crystal surfaces

KW - Superconducting surfaces

KW - Surface defects

KW - Synchrotron radiation photoelectron spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=1142293168&partnerID=8YFLogxK

U2 - 10.1016/j.susc.2003.12.050

DO - 10.1016/j.susc.2003.12.050

M3 - Article

AN - SCOPUS:1142293168

SN - 0039-6028

VL - 551

SP - 219

EP - 227

JO - Surface Science

JF - Surface Science

IS - 3

ER -

Surface electronic structure of the organic superconductor κ-(ET)2Cu(NCS)2 studied via photoemission microscopy

Abstract

Keywords

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