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Charge density wave in layered La1-xCexSb2

AuthorsLuccas, Roberto F.; Fente, A.; Hanko, J.; Correa Orellana, Alexandre; Herrera, E.; Climent-Pascual, Esteban ; Azpeitia-Urkia, Jon ; Pérez-Castañeda, T.; Osorio, M. R.; Salas, Eduardo ; Nemes, N. M. ; Mompean, F. J. ; García-Hernández, M. ; Rodrigo, J. G.; Ramos, M. A.; Guillamón, Isabel; Vieira, S. ; Suderow, Hermann
Issue Date29-Dec-2015
PublisherAmerican Physical Society
CitationPhysical Review - Section B - Condensed Matter 92(23): 235153 (2015)
AbstractThe layered rare-earth diantimonides RSb2 are anisotropic metals with generally low electronic densities whose properties can be modified by substituting the rare earth. LaSb2 is a nonmagnetic metal with a low residual resistivity presenting a low-temperature magnetoresistance that does not saturate with the magnetic field. It has been proposed that the latter can be associated to a charge density wave (CDW), but no CDW has yet been found. Here we find a kink in the resistivity above room temperature in LaSb2 (at 355 K) and show that the kink becomes much more pronounced with substitution of La by Ce along the La1-xCexSb2 series. We find signatures of a CDW in x-ray scattering, specific heat, and scanning tunneling microscopy (STM) experiments in particular for x≈0.5. We observe a distortion of rare-earth-Sb bonds lying in-plane of the tetragonal crystal using x-ray scattering, an anomaly in the specific heat at the same temperature as the kink in resistivity and charge modulations in STM. We conclude that LaSb2 has a CDW which is stabilized in the La1-xCexSb2 series due to substitutional disorder.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.92.235153
Identifiersdoi: 10.1103/PhysRevB.92.235153
e-issn: 1550-235X
issn: 1098-0121
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