Fermi surface of LaSb2 and direct observation of a CDW transition
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2023
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I. Palacio, J. Obando-Guevara, L. Chen, M.N. Nair, M.A.G. Barrio, E. Papalazarou, P. Le Fèvre, A. Taleb-Ibrahimi, E.G. Michel, A. Mascaraque, A. Tejeda, Fermi surface of LaSb2 and direct observation of a CDW transition, Applied Surface Science 610 (2023) 155477. https://doi.org/10.1016/j.apsusc.2022.155477.
Abstract
We have studied the temperature-dependent electronic structure of the light rare-earth 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.