Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-1/2 ladder Rb<sub>2</sub>Cu<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>

ORAL

Abstract

Nontrivial ground states appear in frustrated spin-1/2 chains involving ferromagnetic first-neighbor and antiferromagnetic second-neighbor exchange interactions, where spin-singlet short-range resonating valence bonds connect emergent spin-1 pairs with and without a spontaneously broken parity due to a vector spin chirality order. We report that the frustrated spin-1/2 ladder material Rb2Cu2Mo3O12, on which a ferroelectricity stabilized by a magnetic field has been reported, hosts effective spin-1 pairs forming a tetramer singlet ground state with the Haldane spin gap. Three lowest-energy spin excitations split from the spin-1 triplet by Dzyaloshinski-Moriya interactions are identified in inelastic neutron-scattering and electron spin resonance spectra. Overall experimentally measured magnetic properties are explained from numerical simulations on a frustrated spin-1/2 two-leg ladder model.

*The work was partially supported by JSPS KAKENHI (Grant 24244059, 24740253, 25220803, 25246006, 25800221, 16K05426, 17001001, 17H06137 and 17K14359) and by the RIKEN iTHES project.

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Presenters

  • Hiroshi Ueda

    • Computational Materials Science Research Team, RIKEN Advanced Institute for Computational Science (AICS)

Authors

  • Hiroshi Ueda

    • Computational Materials Science Research Team, RIKEN Advanced Institute for Computational Science (AICS)

  • Shigeki Onoda

    • Condensed Matter Theory Laboratory, RIKEN
    • RIKEN

  • Yasuhiro Yamaguchi

    • Division of Materials Physics, Graduate School of Engineering and Science, Osaka University

  • Tsuyoshi Kimura

    • Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo
    • Department of Advanced Materials Science, University of Tokyo
    • Department of Advanced Material Science, , University of Tokyo
    • The University of Tokyo

  • Daichi Yoshizawa

    • Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University

  • Masayuki Hagiwara

    • Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University
    • Center for Advanced High Magnetic Field Science, Graduate School of Science, Osaka University, Osaka University

  • Masato Hagihara

    • Institute for Solid State Physics, The University of Tokyo

  • Minoru Soda

    • Institute for Solid State Physics, The University of Tokyo

  • Takatsugu Masuda

    • Institute for Solid State Physics, The University of Tokyo

  • Toshio Sakakibara

    • Institute for Solid State Physics, The University of Tokyo
    • University of Tokyo

  • Keisuke Tomiyasu

    • Department of Physics, Tohoku University
    • Departmenet of Physics, Tohoku University

  • Seiko Kawamura

    • JPARC
    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Kenji Nakajima

    • JPARC
    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Ryoichi Kajimoto

    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Mitsutaka Nakamura

    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Yasuhiro Inamura

    • Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency

  • Masashi Hase

    • National Institute for Materials Science (NIMS)

  • Yukio Yasui

    • Department of Physics, Meiji University