1. From a one-dimensional crystal to a one-dimensional liquid: A comprehensive dynamical study of C 60 peapods
- Author
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Bousige, Colin, Rols, Stéphane, Ollivier, Jacques, Schober, Helmut, Fouquet, Peter, Simeoni, Giovanna G., Agafonov, Viatcheslav, Davydov, Valery, Niimi, Yoshiko, Suenaga, Kazutomo, Kataura, Hiromichi, Launois, Pascale, Simeoni, Giovanna, Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Institut Laue-Langevin (ILL), ILL, Heinz Meier-Leibnitz Zentrum and Physics Department (MLZ), GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute (NRI), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Materials science ,Thermal fluctuations ,Nanotechnology ,02 engineering and technology ,Carbon nanotube ,6865−k ,01 natural sciences ,Molecular physics ,law.invention ,Crystal ,6580−g ,law ,Speed of sound ,6148−c ,0103 physical sciences ,010306 general physics ,[PHYS]Physics [physics] ,Plane (geometry) ,Scattering ,Anharmonicity ,Atmospheric temperature range ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,0210 nano-technology ,number(s): 6105F− - Abstract
International audience; We report an inelastic neutron-scattering investigation of the longitudinal acoustic modes of C 60 chains confined inside single walled carbon nanotubes. We take advantage of the orientations of the chains within the plane of the pellet sample to isolate their scattering signatures in the (Q,ω) space, which we follow as a function of temperature from 260 K up to 1100 K. The results show the progressive evolution of the confined chain from a one-dimensional (1D) crystal to a linear liquid, the transition occurring within a temperature range of ∼150 K centered around 600 K. The comparison of the data obtained on monomer and polymer peapods allows extracting the speed of sound in the monomer crystalline chains (v mono = 3.5 km s −1 , v poly /v mono = 1.7). We find that the sound velocity is further reduced by half in the liquid state which reveals that the melting is not only due to harmonic additive thermal fluctuations, but that anharmonic terms in the intermolecular potential play an important role at high temperatures.
- Published
- 2013
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