Study of Charge-Density Wave Transition in Cubic Ce3Co4Sn13 Using Hard X-ray Photoelectron Spectroscopy
A Singh1*, Y. Y. Chin1, H. Y. Huang1, Y. F. Liao1, K. D. Tsuei1, H. J. Lin1, C. N. Kuo2, H. F. Liu2, C. S. Lue2, C. T. Chen1, D. J. Huang1, A. Chainani1
1National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
2Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
* presenting author:Amol Singh, email:rrcat.amol@gmail.com
The compound Ce3Co4Sn13 is a heavy fermion system, which exhibits a charge density wave (CDW) phase transition at ~155 K [1, 2]. In the present study, we used bulk sensitive hard X-ray photoemission spectroscopy (HAXPES) technique to investigate the electronic structure of Ce3Co4Sn13 compound. HAXPES measurements are carried out below and above the CDW transition using (~6.480 keV) incident photon energy. Core levels and valence band spectra of Ce3Co4Sn13 have been measured at 20 K and 170 K temperature. A small finite change in the binding energy is observed at 20 K (CDW phase) for the Sn 3p and Co 2p core level spectra, while Ce 3d core level shows negligible change. This observation is consistent with a recent x-ray fluorescence study at the Ce L3 (≡ 2p) edge and Co K (≡ 1s) edge [2]. Further, valence band spectra show a feature at ~1.5 eV binding energy, which is attributed to Co 3d partial density of states. In the CDW phase, the valence band spectra show a clear Fermi edge, which is consistent with the metallic behavior observed by electrical resistivity in the earlier study [1]. The present HAXPES study indicates very weak charge-disproportionation in Ce3Co4Sn13 across the CDW transition.


References:

[1] C. S. Lue, H. F. Liu, S.-L. Hsu, M. W. Chu, H. Y. Liao, and Y. K. Kuo, Phys. Rev. B 85, 205120 (2012).
[2] Y. Otomo, K. Iwasa, K. Suyama, K. Tomiyasu, H. Sagayama, R. Sagayama, H. Nakao, R. Kumai and Y. Murakami, Phys . Rev. B 94, 075109 (2016).


Keywords: Heavy Fermion, CDW Transition