SURFACE SHIFT OF THE UNOCCUPIED 4F STATE IN LA METAL

被引：27

作者：

FEDOROV, AV

LAUBSCHAT, C

STARKE, K

WESCHKE, E

BARHOLZ, KU

KAINDL, G

机构：

[1] Institut für Experimentalphysik, Freie Universität Berlin, W-1000 Berlin 33

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.70.1719

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using inverse photoemission with variable photon energy (17 less-than-or-equal-to hnu less-than-or-equal-to 25 eV), the existence of a surface shift of the unoccupied 4f state in La metal, analogous to the well-known surface core-level shift in Photoemission from occupied levels, is demonstrated. In the outermost surface layer, the 4f1 electron-addition state shifts by delta(s) = -0.65 +/- 0.10 eV relative to the bulk, i.e., towards the Fermi level, in quantitative agreement with the prediction of a thermochemical model. This observation opens new opportunities in the study of surface phenomena in rare-earth materials by inverse photoemission.

引用

收藏

页码：1719 / 1722

页数：4

相关论文

共 19 条

[1] CORE-LEVEL BINDING-ENERGY AND DENSITY OF STATES FROM SURFACE ATOMS OF GOLD [J].

CITRIN, PH ;

WERTHEIM, GK ;

BAER, Y .

PHYSICAL REVIEW LETTERS, 1978, 41 (20) :1425-1428

[2] PHOTOEMISSION FROM SURFACE-ATOM CORE LEVELS, SURFACE DENSITIES OF STATES, AND METAL-ATOM CLUSTERS - A UNIFIED PICTURE [J].

CITRIN, PH ;

WERTHEIM, GK .

PHYSICAL REVIEW B, 1983, 27 (06) :3176-3200

[3] ON THE ORIGIN OF THE VARIATION OF THE BINDING-ENERGY SHIFTS OF CORE LEVELS BETWEEN SURFACE AND BULK ATOMS IN TRANSITION-METALS [J].

DESJONQUERES, MC ;

SPANJAARD, D ;

LASSAILLY, Y ;

GUILLOT, C .

SOLID STATE COMMUNICATIONS, 1980, 34 (10) :807-810

[4] EXPERIMENTAL PROOF FOR COORDINATION-DEPENDENT VALENCE OF TM METAL [J].

DOMKE, M ;

LAUBSCHAT, C ;

PRIETSCH, M ;

MANDEL, T ;

KAINDL, G ;

SCHNEIDER, WD .

PHYSICAL REVIEW LETTERS, 1986, 56 (12) :1287-1290

[5] DIRECT OBSERVATION OF 4F SPLITTING BETWEEN (110) SURFACE AND BULK ATOMS OF W [J].

DUC, TM ;

GUILLOT, C ;

LASSAILLY, Y ;

LECANTE, J ;

JUGNET, Y ;

VEDRINE, JC .

PHYSICAL REVIEW LETTERS, 1979, 43 (11) :789-792

[6] SURFACE SHIFTS ON RARE-EARTH-METALS [J].

GERKEN, F ;

BARTH, J ;

KAMMERER, R ;

JOHANSSON, LI ;

FLODSTROM, A .

SURFACE SCIENCE, 1982, 117 (1-3) :468-474

[7] A SIMPLE-MODEL CALCULATION FOR XPS, BIS AND EELS 4F-EXCITATIONS IN CE AND LA COMPOUNDS [J].

IMER, JM ;

WUILLOUD, E .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1987, 66 (02) :153-160

[8] CORE-LEVEL BINDING-ENERGY SHIFTS FOR THE METALLIC ELEMENTS [J].

JOHANSSON, B ;

MARTENSSON, N .

PHYSICAL REVIEW B, 1980, 21 (10) :4427-4457

[9] VALENCE STATE AT THE SURFACE OF RARE-EARTH-METALS [J].

JOHANSSON, B .

PHYSICAL REVIEW B, 1979, 19 (12) :6615-6619

[10] STUDY OF THE 4F AND VALENCE BAND DENSITY OF STATES IN RARE-EARTH-METALS .2. EXPERIMENT AND RESULTS [J].

LANG, JK ;

BAER, Y ;

COX, PA .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1981, 11 (01) :121-138