Article Dans Une Revue Applied Surface Science Année : 2023

Fermi surface of LaSb2 and direct observation of a CDW transition

Résumé

We have studied the temperature-dependent electronic structure of the light rareearth antimonide LaSb2 by combining angle-resolved photoemission (ARPES) measurements and density functional theory (DFT) calculations. ARPES measurements show the appearance of band replicas in the low-temperature Fermi surface with q = 0.25±0.02 A-1 and a band folding of the same periodicity with a considerable spectral weight in the folded band. From our calculations we elucidate that the folded band exhibiting the new periodicity is associated with the La-Sb layer. We propose that an in-plane distortion, probably affecting the whole unit cell, is the structural modification related to the electronic changes. All these results converge to support that a charge density wave is stabilized in LaSb2 at low temperature.

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Dates et versions

hal-04285245 , version 1 (14-11-2023)
hal-04285245 , version 2 (14-11-2023)

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I. Palacio, J. Obando-Guevara, L. Chen, M.N. Nair, M.A. González Barrio, et al.. Fermi surface of LaSb2 and direct observation of a CDW transition. Applied Surface Science, 2023, 610, pp.155477. ⟨10.1016/j.apsusc.2022.155477⟩. ⟨hal-04285245v1⟩
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