title: Incommensurate systems as model compounds for disorder revealing low-temperature glasslike behavior.
abstract: We show that the specific heat of incommensurately modulated crystals with broken translational periodicity presents similar features at low temperatures to those of amorphous and glass materials. Here we demonstrate that the excess to the constant C_{p}(T)/T^{3} law (or Debye limit) is made up of an upturn below 1 K and of a broad bump at T≈10 K that directly originates from the gapped phase and amplitude modes of the incommensurate structure. We argue that the low-energy dynamics of incommensurate systems constitute a plausible simplification of the landscape of interactions present in glasses, giving rise to their low-temperature anomalies.
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Reményi
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.|TU Dresden, Institut für Festkörperphysik, D-01062, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Sahling
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.|Institute of Physics, Bijenička cesta 46, HR-10000 Zagreb, Croatia.
authors.forename: K
authors.initials: K
authors.lastname: Biljaković
authors.affiliation: Institute of Physics, Bijenička cesta 46, HR-10000 Zagreb, Croatia.
authors.forename: D
authors.initials: D
authors.lastname: Starešinić
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: J-C
authors.initials: JC
authors.lastname: Lasjaunias
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: J E
authors.initials: JE
authors.lastname: Lorenzo
authors.affiliation: Université Grenoble Alpes, Institut Néel F-38042 Grenoble, France.|CNRS, Institut Néel, F-38042 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Monceau
authors.affiliation: European Synchrotron Radiation Facility, 6 rue Jules Horowitz, B.P. 220, 38043 Grenoble, France.|CNRS, Université Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France.
authors.forename: A
authors.initials: A
authors.lastname: Cano