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

10 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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