Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-12 ladder

H. Ueda, S. Onoda, Y. Yamaguchi, T. Kimura, D. Yoshizawa, T. Morioka, M. Hagiwara, M. Hagihala, M. Soda, T. Masuda, T. Sakakibara, K. Tomiyasu, S. Ohira-Kawamura, K. Nakajima, R. Kajimoto, M. Nakamura, Y. Inamura, N. Reynolds, M. Frontzek, J. S. WhiteM. Hase, Y. Yasui

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Abstract

We report experimental and theoretical evidence that Rb2Cu2Mo3O12 has a nonmagnetic tetramer ground state of a two-leg ladder comprising antiferromagnetically coupled frustrated spin-12 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.

Original languageEnglish
Article number140408
JournalPhysical Review B
Volume101
Issue number14
DOIs
Publication statusPublished - 1 Apr 2020

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    Ueda, H., Onoda, S., Yamaguchi, Y., Kimura, T., Yoshizawa, D., Morioka, T., Hagiwara, M., Hagihala, M., Soda, M., Masuda, T., Sakakibara, T., Tomiyasu, K., Ohira-Kawamura, S., Nakajima, K., Kajimoto, R., Nakamura, M., Inamura, Y., Reynolds, N., Frontzek, M., ... Yasui, Y. (2020). Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-12 ladder. Physical Review B, 101(14), [140408]. https://doi.org/10.1103/PhysRevB.101.140408