Unusual line shape of B 1s core level spectra in rare earth hexaborides |
| |
Authors: | Swapnil Patil Geetha Balakrishnan |
| |
Institution: | a Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, Indiab Department of Physics, University of Warwick, Coventry, CV4 7AL, UK |
| |
Abstract: | We investigate the B 1s core level spectra of hexaborides, ( , Ce, Pr, Nd), using high resolution X-ray photoemission spectroscopy. While all the B sites are identical, the experimental spectra exhibit a signature of multiple features manifested as an unusual asymmetry in the lower binding energy side. The analysis of the spectra reveals that the surface and bulk photoemission signals are different. In addition, the peak position shifts towards lower binding energies with the increase in 4f binding energy of the rare earth elements that can be attributed to the chemical potential shift due to lower degree of 4f-conduction electron hybridization. Decrease in temperature leads to a narrowing of the linewidth in every case. The Kondo systems exhibit more prominent narrowing of the B 1s linewidth. |
| |
Keywords: | A Hexaborides D Kondo effect D Surface effect E Photoemission |
本文献已被 ScienceDirect 等数据库收录! |
|