Soft x-ray photoelectron spectroscopy study of type-I clathrates
Extensive soft x-ray photoelectron spectroscopy studies are performed on Ba8 Ga16 Ge30 (BGG) and Sr8Ga16Ge30 (SGG) single crystals ranging from Fermi to core levels, at a high-energy facility. Valence band x-ray photoelectron spectroscopy (XPS) experiments with theoretical calculations revealed that...
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2008-01-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | http://dx.doi.org/10.1088/1468-6996/9/4/044207 |
| _version_ | 1818553589984919552 |
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| author | Jun Tang, Zhaofei Li, Jing Ju, Ryotaro Kumashiro, Marcos A. Avila, Kouichirou Suekuni, Toshiro Takabatake, FangZhun Guo, Keisuke Kobayashi, Koji Akai and Katsumi Tanigaki |
| author_facet | Jun Tang, Zhaofei Li, Jing Ju, Ryotaro Kumashiro, Marcos A. Avila, Kouichirou Suekuni, Toshiro Takabatake, FangZhun Guo, Keisuke Kobayashi, Koji Akai and Katsumi Tanigaki |
| author_sort | Jun Tang, Zhaofei Li, Jing Ju, Ryotaro Kumashiro, Marcos A. Avila, Kouichirou Suekuni, Toshiro Takabatake, FangZhun Guo, Keisuke Kobayashi, Koji Akai and Katsumi Tanigaki |
| collection | DOAJ |
| description | Extensive soft x-ray photoelectron spectroscopy studies are performed on Ba8 Ga16 Ge30 (BGG) and Sr8Ga16Ge30 (SGG) single crystals ranging from Fermi to core levels, at a high-energy facility. Valence band x-ray photoelectron spectroscopy (XPS) experiments with theoretical calculations revealed that the valence band is mainly constructed by the Ge/Ga 4s and 4p wave functions with little contribution of the Ba/Sr atomic orbitals. Surprisingly, unexpected features evidencing the different shift for the 2a- and 6d- sites between Ba 4d and Sr 3d are observed. The detailed analyses including theoretical support by first-principles band-structure calculations lead to the conclusion that the component distributions of the larger tetrakaidecahedral cage are different depending on the endohedral atoms, which contrasts with the past consensus that BGG and SGG have the same framework structure. This may give thorough reconsiderations on earlier interpretations of experimental data. |
| first_indexed | 2024-12-12T09:27:49Z |
| format | Article |
| id | doaj.art-f5caf474516d4940a91a5d0891e1e184 |
| institution | Directory Open Access Journal |
| issn | 1468-6996 1878-5514 |
| language | English |
| last_indexed | 2024-12-12T09:27:49Z |
| publishDate | 2008-01-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj.art-f5caf474516d4940a91a5d0891e1e1842022-12-22T00:28:59ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142008-01-0194044207Soft x-ray photoelectron spectroscopy study of type-I clathratesJun Tang, Zhaofei Li, Jing Ju, Ryotaro Kumashiro, Marcos A. Avila, Kouichirou Suekuni, Toshiro Takabatake, FangZhun Guo, Keisuke Kobayashi, Koji Akai and Katsumi TanigakiExtensive soft x-ray photoelectron spectroscopy studies are performed on Ba8 Ga16 Ge30 (BGG) and Sr8Ga16Ge30 (SGG) single crystals ranging from Fermi to core levels, at a high-energy facility. Valence band x-ray photoelectron spectroscopy (XPS) experiments with theoretical calculations revealed that the valence band is mainly constructed by the Ge/Ga 4s and 4p wave functions with little contribution of the Ba/Sr atomic orbitals. Surprisingly, unexpected features evidencing the different shift for the 2a- and 6d- sites between Ba 4d and Sr 3d are observed. The detailed analyses including theoretical support by first-principles band-structure calculations lead to the conclusion that the component distributions of the larger tetrakaidecahedral cage are different depending on the endohedral atoms, which contrasts with the past consensus that BGG and SGG have the same framework structure. This may give thorough reconsiderations on earlier interpretations of experimental data.http://dx.doi.org/10.1088/1468-6996/9/4/044207thermoelectricsynchrotron radiationx-ray photoelectron spectroscopyvalence bandcore level |
| spellingShingle | Jun Tang, Zhaofei Li, Jing Ju, Ryotaro Kumashiro, Marcos A. Avila, Kouichirou Suekuni, Toshiro Takabatake, FangZhun Guo, Keisuke Kobayashi, Koji Akai and Katsumi Tanigaki Soft x-ray photoelectron spectroscopy study of type-I clathrates Science and Technology of Advanced Materials thermoelectric synchrotron radiation x-ray photoelectron spectroscopy valence band core level |
| title | Soft x-ray photoelectron spectroscopy study of type-I clathrates |
| title_full | Soft x-ray photoelectron spectroscopy study of type-I clathrates |
| title_fullStr | Soft x-ray photoelectron spectroscopy study of type-I clathrates |
| title_full_unstemmed | Soft x-ray photoelectron spectroscopy study of type-I clathrates |
| title_short | Soft x-ray photoelectron spectroscopy study of type-I clathrates |
| title_sort | soft x ray photoelectron spectroscopy study of type i clathrates |
| topic | thermoelectric synchrotron radiation x-ray photoelectron spectroscopy valence band core level |
| url | http://dx.doi.org/10.1088/1468-6996/9/4/044207 |
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