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

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

doi:10.1103/PhysRevB.101.140408

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

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Nakamura, M., Hase, Masashi, Kajimoto, R., Morioka, T., Sakakibara, T., Frontzek, M., Reynolds, N., Hagiwara, M., Kimura, T., Yamaguchi, Y., Tomiyasu, K., White, J. S., Onoda, S., Masuda, T., Ohira-Kawamura, S., Soda, M., Ueda, H., Nakajima, K., Inamura, Y., Yasui, Y., Yoshizawa, D., Hagihala, M.. Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-1/2 ladder. https://doi.org/10.1103/PhysRevB.101.140408

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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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Keyword: Rb2Cu2Mo3O12, ferroelectricity, Haldane gap, frustrated spin-1/2 ladder

Date published: 2020-04-22

Publisher: American Physical Society

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Manuscript type: Not a journal article

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First published URL: https://doi.org/10.1103/PhysRevB.101.140408

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Updated at: 2024-01-05 22:13:43 +0900

Published on MDR: 2021-08-14 03:54:46 +0900

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