Structure-dependent mixed valence of Sm on Cu(1 1 1) studied by XPS and STM

Yasuo Nakayama; Hiroshi Kondoh; Toshiaki Ohta

doi:10.1016/j.susc.2004.01.020

Structure-dependent mixed valence of Sm on Cu(1 1 1) studied by XPS and STM

Yasuo Nakayama, Hiroshi Kondoh, Toshiaki Ohta

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

13 Citations (Scopus)

Abstract

Geometric and electronic structures of adsorbed Sm on Cu(1 1 1) were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). The surface morphology and Sm valency change with the Sm coverage, suggesting that Sm atoms in the islands have a valence of approximately 2.7 and those diffusing are divalent. Heating the adlayers yields surface alloy and close-packed overlayer of Sm depending on the coverage and temperature. Atomically resolved STM images indicate that the surface of the alloy phase is not rigid. The closed packed overlayer of a mixed valence Sm is observed as a uniform atomic species.

Original language	English
Pages (from-to)	53-62
Number of pages	10
Journal	Surface Science
Volume	552
Issue number	1-3
DOIs	https://doi.org/10.1016/j.susc.2004.01.020
Publication status	Published - 2004 Mar 10
Externally published	Yes

Keywords

Copper
Growth
Lanthanides
Low energy electron diffraction (LEED)
Scanning tunneling microscopy
Surface structure, morphology, roughness, and topography
X-ray photoelectron spectroscopy

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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title = "Structure-dependent mixed valence of Sm on Cu(1 1 1) studied by XPS and STM",

abstract = "Geometric and electronic structures of adsorbed Sm on Cu(1 1 1) were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). The surface morphology and Sm valency change with the Sm coverage, suggesting that Sm atoms in the islands have a valence of approximately 2.7 and those diffusing are divalent. Heating the adlayers yields surface alloy and close-packed overlayer of Sm depending on the coverage and temperature. Atomically resolved STM images indicate that the surface of the alloy phase is not rigid. The closed packed overlayer of a mixed valence Sm is observed as a uniform atomic species.",

keywords = "Copper, Growth, Lanthanides, Low energy electron diffraction (LEED), Scanning tunneling microscopy, Surface structure, morphology, roughness, and topography, X-ray photoelectron spectroscopy",

author = "Yasuo Nakayama and Hiroshi Kondoh and Toshiaki Ohta",

note = "Funding Information: The authors would like to thank Dr. S.M. Gray and Prof. J.N. Andersen of Lund University, and Dr. M. Yoshitake of National Institute for Materials Science for helpful discussions. This work was financially supported by the Grant-in-Aids for scientific research (nos. 11640576, 10304059) and for The 21st Century COE Program from the Ministry of Education, Culture, Sports, Science and Technology.",

year = "2004",

month = mar,

day = "10",

doi = "10.1016/j.susc.2004.01.020",

language = "English",

volume = "552",

pages = "53--62",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier",

number = "1-3",

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TY - JOUR

T1 - Structure-dependent mixed valence of Sm on Cu(1 1 1) studied by XPS and STM

AU - Nakayama, Yasuo

AU - Kondoh, Hiroshi

AU - Ohta, Toshiaki

N1 - Funding Information: The authors would like to thank Dr. S.M. Gray and Prof. J.N. Andersen of Lund University, and Dr. M. Yoshitake of National Institute for Materials Science for helpful discussions. This work was financially supported by the Grant-in-Aids for scientific research (nos. 11640576, 10304059) and for The 21st Century COE Program from the Ministry of Education, Culture, Sports, Science and Technology.

PY - 2004/3/10

Y1 - 2004/3/10

N2 - Geometric and electronic structures of adsorbed Sm on Cu(1 1 1) were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). The surface morphology and Sm valency change with the Sm coverage, suggesting that Sm atoms in the islands have a valence of approximately 2.7 and those diffusing are divalent. Heating the adlayers yields surface alloy and close-packed overlayer of Sm depending on the coverage and temperature. Atomically resolved STM images indicate that the surface of the alloy phase is not rigid. The closed packed overlayer of a mixed valence Sm is observed as a uniform atomic species.

AB - Geometric and electronic structures of adsorbed Sm on Cu(1 1 1) were studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). The surface morphology and Sm valency change with the Sm coverage, suggesting that Sm atoms in the islands have a valence of approximately 2.7 and those diffusing are divalent. Heating the adlayers yields surface alloy and close-packed overlayer of Sm depending on the coverage and temperature. Atomically resolved STM images indicate that the surface of the alloy phase is not rigid. The closed packed overlayer of a mixed valence Sm is observed as a uniform atomic species.

KW - Copper

KW - Growth

KW - Lanthanides

KW - Low energy electron diffraction (LEED)

KW - Scanning tunneling microscopy

KW - Surface structure, morphology, roughness, and topography

KW - X-ray photoelectron spectroscopy

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U2 - 10.1016/j.susc.2004.01.020

DO - 10.1016/j.susc.2004.01.020

M3 - Article

AN - SCOPUS:1342283615

VL - 552

SP - 53

EP - 62

JO - Surface Science

JF - Surface Science

SN - 0039-6028

IS - 1-3

ER -

Structure-dependent mixed valence of Sm on Cu(1 1 1) studied by XPS and STM

Abstract

Keywords

ASJC Scopus subject areas

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