Fermi surface of LaSb2 and direct observation of a CDW transition
Résumé
We have studied the temperature-dependent electronic structure of the light rare-13 earth antimonide LaSb2 by combining angle-resolved photoemission (ARPES) 14 measurements and density functional theory (DFT) calculations. ARPES 15 measurements show the appearance of band replicas in the low-temperature 16 Fermi surface with q = 0.25±0.02 A-1 and a band folding of the same periodicity 17 with a considerable spectral weight in the folded band. From our calculations we 18 elucidate that the folded band exhibiting the new periodicity is associated with the 19 La-Sb layer. We propose that an in-plane distortion, probably affecting the whole 20 unit cell, is the structural modification related to the electronic changes. All these 21 results converge to support that a charge density wave is stabilized in LaSb2 at 22 low temperature.
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