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Quantum ferroelectricity in charge-transfer complex crystals

Author

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  • Sachio Horiuchi

    (National Institute of Advanced Industrial Science and Technology (AIST)
    CREST, Japan Science and Technology Agency (JST))

  • Kensuke Kobayashi

    (Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK))

  • Reiji Kumai

    (CREST, Japan Science and Technology Agency (JST)
    Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK))

  • Nao Minami

    (The University of Tokyo)

  • Fumitaka Kagawa

    (CREST, Japan Science and Technology Agency (JST)
    RIKEN Center for Emergent Matter Science (CEMS))

  • Yoshinori Tokura

    (The University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Quantum phase transition achieved by fine tuning the continuous phase transition down to zero kelvin is a challenge for solid state science. Critical phenomena distinct from the effects of thermal fluctuations can materialize when the electronic, structural or magnetic long-range order is perturbed by quantum fluctuations between degenerate ground states. Here we have developed chemically pure tetrahalo-p-benzoquinones of n iodine and 4–n bromine substituents (QBr4–nIn, n=0–4) to search for ferroelectric charge-transfer complexes with tetrathiafulvalene (TTF). Among them, TTF–QBr2I2 exhibits a ferroelectric neutral–ionic phase transition, which is continuously controlled over a wide temperature range from near-zero kelvin to room temperature under hydrostatic pressure. Quantum critical behaviour is accompanied by a much larger permittivity than those of other neutral–ionic transition compounds, such as well-known ferroelectric complex of TTF–QCl4 and quantum antiferroelectric of dimethyl–TTF–QBr4. By contrast, TTF–QBr3I complex, another member of this compound family, shows complete suppression of the ferroelectric spin-Peierls-type phase transition.

Suggested Citation

  • Sachio Horiuchi & Kensuke Kobayashi & Reiji Kumai & Nao Minami & Fumitaka Kagawa & Yoshinori Tokura, 2015. "Quantum ferroelectricity in charge-transfer complex crystals," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8469
    DOI: 10.1038/ncomms8469
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    Cited by:

    1. Krzysztof A. Bogdanowicz, 2021. "Bi-Triggering Energy Harvesters: Is It Possible to Generate Energy in a Solar Panel under Any Conditions?," Energies, MDPI, vol. 14(18), pages 1-28, September.

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