From a one-dimensional crystal to a one-dimensional liquid: A comprehensive dynamical study of C60 peapods

Colin Bousige, Stéphane Rols, Jacques Ollivier, Helmut Schober, Peter Fouquet, Giovanna G. Simeoni, Viatcheslav Agafonov, Valery Davydov, Yoshiko Niimi, Kazutomo Suenaga, Hiromichi Kataura, and Pascale Launois
Phys. Rev. B 87, 195438 – Published 22 May 2013

Abstract

We report an inelastic neutron-scattering investigation of the longitudinal acoustic modes of C60 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 (vmono=3.5 km s1, vpoly/vmono=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.

  • Received 25 January 2013

DOI:https://doi.org/10.1103/PhysRevB.87.195438

©2013 American Physical Society

Authors & Affiliations

Colin Bousige

  • Institut Laue Langevin, 6 rue Jules Horowitz, B.P. 156, F-38042 Grenoble Cedex 9, France and Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, F-91405 Orsay, France

Stéphane Rols*, Jacques Ollivier, Helmut Schober, and Peter Fouquet

  • Institut Laue Langevin, 6 rue Jules Horowitz, B.P. 156, F-38042 Grenoble Cedex 9, France

Giovanna G. Simeoni

  • Forschungsneutronenquelle Heinz Maier-Leibnitz, Technische Universität München, 85747 Garching, Germany

Viatcheslav Agafonov

  • GREMAN, UMR CNRS 6157, F-37200 Tours, France

Valery Davydov

  • Institute of High Pressure Physics of the RAS, R-142092 Troitsk, Moscow Region, Russian Federation

Yoshiko Niimi and Kazutomo Suenaga

  • Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, Tsukuba 305-8565, Japan

Hiromichi Kataura

  • Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 4, Higashi 1-1-1, Tsukuba, Ibaraki 305-8562, Japan

Pascale Launois

  • Laboratoire de Physique des Solides, UMR CNRS 8502, Université Paris-Sud, F-91405 Orsay, France

  • *Corresponding author: rols@ill.fr
  • Corresponding author: pascale.launois@u-psud.fr

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 87, Iss. 19 — 15 May 2013

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×