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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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- 22/04/2020
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- 22/04/2020
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- 30/09/2020
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PRB101_140408_R__2020.pdf | 09/07/2020 | 1.98 MB | MDR Open |
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