| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of Cleaving Temperature on the Surface and Bulk Fermi Surface of Sr2RuO4 Investigated by High Resolution Angle-Resolved Photoemission |
| LIU Shan-Yu1, ZHANG Wen-Tao1, WENG Hong-Ming1, ZHAO Lin1, LIU Hai-Yun1, JIA Xiao-Wen1, LIU Guo-Dong1, DONG Xiao-Li1, ZHANG Jun1, MAO Zhi-Qiang2, CHEN Chuang-Tian3, XU Zu-Yan3, DAI Xi1, FANG Zhong1, ZHOU Xing-Jiang1** |
1National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
3Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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LIU Shan-Yu, ZHANG Wen-Tao, WENG Hong-Ming et al 2012 Chin. Phys. Lett. 29 067401 |
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Abstract High resolution angle-resolved photoemission measurements are carried out to systematically investigate the effect of cleaving temperature on the electronic structures and Fermi surfaces of Sr2RuO4. Unlike previous reports, which found that a high cleaving temperature can suppress the surface Fermi surface, we find that the surface Fermi surface remains obvious and strong in Sr2RuO4 cleaved at high temperature, even at room temperature. This indicates that cleaving temperature is not a key effective factor in suppressing surface bands. On the other hand, the bulk bands can be enhanced in an aged surface of Sr2RuO4 that has been cleaved and held for a long time. We have also carried out laser ARPES measurements on Sr2RuO4 by using a vacuum ultra-violet laser (photon energy at 6.994 eV) and found an obvious enhancement of bulk bands even for samples cleaved at low temperature. This information is important for realizing an effective approach to manipulating and detecting the surface and bulk electronic structure of Sr2RuO4. In particular, the enhancement of bulk sensitivity, along with the super-high instrumental resolution of VUV laser ARPES, will be advantageous in investigating fine electronic structure and superconducting properties of Sr2RuO4 in the future.
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| Keywords:
74.70.Pq
71.20.-b
73.20.At
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Received: 28 May 2012
Published: 31 May 2012
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| PACS: |
74.70.Pq
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(Ruthenates)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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73.20.At
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(Surface states, band structure, electron density of states)
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