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Schematic drawing of Compton scattering spectrometer in­stalled in BL08W.

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Fig. 9(Color online) Two­dimensional electron occupation num­
ber densities of CeRu2Si2 obtained at (a) 5 K and (b) room
temperature.

Ås[N\¢ð¦µÄ¢½§xªCº·ÅÍå«­¸­µÄ¢éÌªª©éB±ÌÏ»ÍCá·ÅÕðIÅ

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Fig. 10ib)æ15oh¨æÑ(c)tF~ÊÌ\¢ÉÖW·éohÌaC»ê¼êÉÂ¢Äß½ 2 ³dqèL§(Color online) Two­dimensional electron occupation num­
ber densities of (a) the 14th, (b) the 15th, and (c) the sum
total of relevant bands in CeRu2Si2 derived from the resultof band calculation with a f electron itinerant model.

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Fig. 11

Fig. 12(Color online) Phase diagram of La2_xSrxCuO4.

Crystal structure of La2_xSrxCuO4.

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Schematic view of electronic structure of La2_xSrxCuO4.

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Fig. 14

Fig. 15(Color online) Momentum density distributions of doped
holes in (a) underdoped region and (b) overdoped region.
The square is the rst Brillouin zone.
Fig. 16(Color online) Molecular orbitals for A­type and B­typefeatures: (a) A­type feature is associated with predominant­ly Cu 3dx2­y2 state, coupled with the molecular orbital offour O 2p's to form the Zhang­Rice singlet; (b) B­type fea­
ture is assigned to Cu 3dz2 state hybridized with the node­less molecular orbital of four O 2p's.

Fig. 17(Color online) Directional symmetry of Cu_O octahedral
molecular orbitals. Momentum density distributions of themolecular orbitals: (A) Zhang­Rice state formed by only O
2p orbitals; (B) Zhang­Rice state hybridized with Cu 3dx2
­y2; (C) Node­less state formed by only O 2p orbitals; (D)Node­less state hybridized with Cu 3dz2.

(Color online) Schematic view of the A­type and the B­typefeatures observed in Fig. 14.

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Recent progress in the study of electronic statesby means of Compton scattering
Akihisa KOIZUMIGraduate School of Material Science, University of Hyogo,
Hyogo 678_1297, Japan

Masayoshi ITOU

Japan Synchrotron Radiation Research Institute and SPring­8,
Hyogo 679_5198, Japan

Yoshiharu SAKURAI

Japan Synchrotron Radiation Research Institute and SPring­8,
Hyogo 679_5198, Japan

Abstract

Electrons in materials are moving. Since Compton scattering is elastic collision between an X­rayphoton and an electron, one can obtain information about electron motion by the analysis of Com­
pton scattered x­rays. Therefore, Compton scattering is used as a tool for investigating the elec­
tronic state of materials. In this article, we explain how to derive electron momentum density andFermi surface from Compton prole measurement and its analysis, and subsequently introduce
the recent ndings on heavy fermion material CeRu2Si2 and cuprate superconductor La2_xSrxCuO4.

úËõ May 2012 Vol.25 No.3  165