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26 April 2024 |
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An angle-resolved soft x-ray spectroscopy study of the electronic states of single crystal MgB2 | | G. P. Zhang
; G. S. Chang
; T. A. Callcott
; D. L. Ederer
; W. N. Kang
; Eun-Mi Choi
; Hyeong-Jin Kim
; Sung-Ik Lee
; | | Date: |
24 Feb 2003 | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Affiliation: | 1,2), G. S. Chang , T. A. Callcott , D. L. Ederer , W. N. Kang, Eun-Mi Choi, Hyeong-Jin Kim, Sung-Ik Lee ( University of Tennessee at Knoxville, Indiana State University, Tulane University, National Creative Research Initiative Center for Supercon | | Abstract: | Angle-resolved soft x-ray measurements made at the boron K-edge in single crystal MgB2 provide new insights into the B-2p local partial density of both unoccupied and occupied band states. The strong variation of absorption with incident angle of exciting x-rays permits the clear separation of contributions from sigma states in the boron plane and pi states normal to the plane. A careful comparison with theory accurately determines the energy of selected critical $k$ points in the conduction band. Resonant inelastic x-ray emission at an incident angle of 15 degrees shows a large enhancement of the emission spectra within about 0.5 eV of the Fermi level that is absent at 45 degrees and is much reduced at 60 degrees. We conclude that momentum transferred from the resonant inelastic x-ray scattering (RIXS) process couples empty and filled states across the Fermi level. | | Source: | arXiv, cond-mat/0302466 | | Services: | Forum | Review | PDF | Favorites | |
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