ELECTRONIC-PROPERTIES OF LOW-DIMENSIONAL SM FILMS ADSORBED ON CR(211) AND CR(110)

被引：15
作者：
DUBOT, P
ALLENO, E
BARTHESLABROUSSE, MG
BINNS, C
NICKLIN, C
NORRIS, C
RAVOT, D
机构：
[1] UNIV LEICESTER,DEPT PHYS,LEICESTER LE1 7RH,ENGLAND
[2] CNRS,CHIM MET TERRES RARES LAB,F-92190 MEUDON,FRANCE
来源：
SURFACE SCIENCE | 1993年 / 282卷 / 1-2期
关键词：
D O I：
10.1016/0039-6028(93)90605-J
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The electronic properties of samarium layers adsorbed on Cr(211) and Cr(110) surfaces have been studied by XPS and EELS measurements and correlated to previous structural investigations by LEED and AES. The valence state of samarium has been discussed in terms of substrate-adsorbate interactions. For strong Cr-Sm interactions (ordered adlayer structures in registry with the substrate or disordered adsorption in the grooves of the Cr(211) face) only the trivalent Sm state is observed. When Sm-Sm interactions are dominant (dense disordered or incommensurate layers) a mixed-valence character appears and an intermediate value of 2.75 +/- 0.05 is observed for the dense monolayer. Preliminary photodiffraction experiments on Cr(110) suggest that the intermediate valence observed at monolayer coverage could be homogeneous.
引用
收藏
页码：1 / 9
页数：9
相关论文
共 33 条
  • [1] ALLENO E, UNPUB, P24420
  • [2] MIXED-VALENCE OF SM ON METAL SINGLE-CRYSTAL SURFACES
    ANDERSEN, JN
    CHORKENDORFF, I
    ONSGAARD, J
    GHIJSEN, J
    JOHNSON, RL
    GREY, F
    [J]. PHYSICAL REVIEW B, 1988, 37 (09): : 4809 - 4812
  • [3] DIRECT DETERMINATION OF SURFACE-STRUCTURES FROM PHOTOELECTRON DIFFRACTION
    BARTON, JJ
    BAHR, CC
    HUSSAIN, Z
    ROBEY, SW
    KLEBANOFF, LE
    SHIRLEY, DA
    [J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1984, 2 (02): : 847 - 851
  • [4] LOW-ENERGY ELECTRON EXCHANGE EXCITATION OF 4F TRANSITIONS AND LOCATION OF 4F LEVELS IN RARE-EARTHS
    BAUER, E
    KOLACZKIEWICZ, J
    [J]. PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1985, 131 (02): : 699 - 706
  • [5] EVIDENCE FOR DIVALENCY AT THE SURFACE OF SM METAL FROM ELECTRON-ENERGY-LOSS SPECTROSCOPY
    BERTEL, E
    STRASSER, G
    NETZER, FP
    MATTHEW, JAD
    [J]. PHYSICAL REVIEW B, 1982, 25 (05): : 3374 - 3376
  • [6] EFFECT OF SM VALENCE CHANGES ON PHOTOEMISSION SPECTRA
    DENBOER, ML
    CHANG, CL
    HORN, S
    MURGAI, V
    [J]. PHYSICAL REVIEW B, 1988, 37 (12): : 6605 - 6610
  • [7] STRUCTURAL-PROPERTIES OF LOW-DIMENSIONAL SM FILMS ADSORBED ON CR(211)
    DUBOT, P
    DENJEAN, P
    BARTHESLABROUSSE, MG
    [J]. SURFACE SCIENCE, 1991, 258 (1-3) : 35 - 43
  • [8] DUBOT P, 1990, VACUUM, V41, P753
  • [9] MIXED-VALENCE IN SM OVERLAYERS ON AL(001)
    FALDT, A
    MYERS, HP
    [J]. PHYSICAL REVIEW B, 1984, 30 (10): : 5481 - 5486
  • [10] VALENCE OF SM ADSORBED ON PD(001)
    FALDT, A
    KRISTENSSON, DK
    MYERS, HP
    [J]. PHYSICAL REVIEW B, 1988, 37 (05): : 2682 - 2684
1234