Tunneling motion and antiferroelectric ordering of lithium cations trapped inside carbon cages

Shinobu Aoyagi, Akio Tokumitu, Kunihisa Sugimoto, Hiroshi Okada, Norihisa Hoshino, Tomoyuki Akutagawa

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Dielectric and X-ray diffraction measurements of [Li@C60](PF6) single crystals reveal the motion of the Li+ cations inside the C60 cages at low temperature. An increase in the dielectric permittivity below 100 K is consistent with a combined tunneling and hopping motion of the Li+ cation between two positions inside the C60 cage. A phase transition accompanied by a decrease in the dielectric permittivity at TC = 24 K is explained by an antiferroelectric ordering of the Li+ cations. The Li+ ordering is caused by interactions among electric dipole moments formed between the Li+ cations inside and the PF6 - anions outside the C60 cages. The electric dipole moments that are switched by the Li+ tunneling and interact with each other are potential qubits in a quantum computer using electric dipole moments.

    Original languageEnglish
    Article number094605
    Journaljournal of the physical society of japan
    Volume85
    Issue number9
    DOIs
    Publication statusPublished - 2016 Sep 15

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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