Anharmonicity and Universal Response of Linear Carbon Chain Mechanical Properties under Hydrostatic Pressure

ORAL

Abstract

Isolated linear carbon chains (LCCs) encapsulated by multiwalled carbon nanotubes are studied under hydrostatic pressure (P) via resonance Raman scattering. The LCCs’ spectroscopic signature C band around 1850 cm−1 softens linearly with increasing P. A simple anharmonic force-constant model not only describes such softening but also shows that the LCCs’ Young’s modulus (E), Grüneisen parameter (γ), and strain (ε) follow universal P−1 and P2 laws, respectively. In particular, γ also presents a unified behavior for all LCCs. To the best of our knowledge, these are the first results reported on such isolated systems and the first work to explore universal P-dependent responses for LCCs’ E, ε, and γ.

*This material is based upon work supported by the National Science Foundation under Grant No. 1848418. P. T. A., K. S., N. M. B. N., N. L. C., and A. R. P. acknowledge both the American Physical Society (APS) and the Brazilian Physical Society (SBF, Portuguese acronym) for supporting this research through the Brazil-U.S. Ph.D. Exchange program.

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Presenters

  • Keshav Sharma

    • Department of Physics and Astronomy, University of Alabama

Authors

  • Keshav Sharma

    • Department of Physics and Astronomy, University of Alabama

  • Nathalia Leal Costa

    • Department of Physics, Federal University of Ceara

  • Yoong Ahm Kim

    • Department of Polymer Engineering, Chonnam National University

  • Hiroyuki Muramatsu

    • Research Institute for Supra-Materials, Shinshu University

  • Luiz Gustavo Pimenta Martins

    • Department of Electrical Engineering, Massachusetts Institute of Technology

  • Jing Kong

    • Department of Electrical Engineering, Massachusetts Institute of Technology
    • Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Newton Martins Barbosa Neto

    • Graduate Program in Physics, Federal University of Para

  • Alexandre Rocha Paschoal

    • Department of Physics, Federal University of Ceara

  • Paulo T Araujo

    • Department of Physics and Astronomy, University of Alabama