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Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-1/2 ladder

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We report experimental and theoretical evidence that Rb2Cu2Mo3O12 has a nonmagnetic tetramer ground state of a two-leg ladder comprising　antiferromagnetically coupled frustrated spin- 1/2 chains and exhibits a Haldane spin gap of emergent spin-1 pairs. Three spin excitations split from the spin-1 triplet by a Dzyaloshinskii-Moriya interaction are identified in inelastic neutron-scattering and electron spin resonance spectra. A tiny magnetic field generates ferroelectricity without closing the spin gap, indicating a unique class of ferroelectricity induced by a vector spin chirality order.

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Creator
  • Name
    Ueda, H.
    Organization
    RIKEN
    Role
    author
    Name
    Inamura, Y.
    Organization
    Japan Atomic Energy Agency
    Role
    author
    Name
    Ohira-Kawamura, S.
    Organization
    Japan Atomic Energy Agency
    Role
    author
    Name
    Yasui, Y.
    Organization
    Meiji University
    Role
    author
    Name
    White, J. S.
    Organization
    Paul Scherrer Institut
    Role
    author
    Name
    Onoda, S.
    Organization
    RIKEN
    Role
    author
    Name
    Nakajima, K.
    Organization
    Japan Atomic Energy Agency
    Role
    author
    Name
    Reynolds, N.
    Organization
    Paul Scherrer Institut
    Role
    author
    Name
    Nakamura, M.
    Organization
    Japan Atomic Energy Agency
    Role
    author
    Name
    Yamaguchi, Y.
    Organization
    Osaka University
    Role
    author
    Name
    Hase, Masashi
    ORCID
    https://orcid.org/0000-0003-2717-461X
    Organization
    National Institute for Materials Science
    Role
    author
    Name
    Soda, M.
    Organization
    The University of Tokyo
    Sub organization
    Institute for Solid State Physics
    Role
    author
    Name
    Kajimoto, R.
    Organization
    Japan Atomic Energy Agency
    Role
    author
    Name
    Tomiyasu, K.
    Organization
    Tohoku University
    Role
    author
    Name
    Hagihala, M.
    Organization
    The University of Tokyo
    Sub organization
    Institute for Solid State Physics
    Role
    author
    Name
    Morioka, T.
    Organization
    Osaka University
    Role
    author
    Name
    Hagiwara, M.
    Organization
    Osaka University
    Role
    author
    Name
    Masuda, T.
    Organization
    The University of Tokyo
    Sub organization
    Institute for Solid State Physics
    Role
    author
    Name
    Frontzek, M.
    Organization
    Paul Scherrer Institut
    Role
    author
    Name
    Kimura, T.
    Organization
    The University of Tokyo
    Role
    author
    Name
    Sakakibara, T.
    Organization
    The University of Tokyo
    Sub organization
    Institute for Solid State Physics
    Role
    author
    Name
    Yoshizawa, D.
    Organization
    Osaka University
    Role
    author
Keyword
Resource type
Publisher
Date published
  • 22/04/2020
Rights statement
Licensed Date
  • 22/04/2020
Journal
  • Title
    Physical Review B
    Volume
    101
    Issue
    14
    Sequence number
    140408
    Total number of pages
    6
Language
Last modified
  • 30/09/2020
Other Date
  • Published
    22/04/2020

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