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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author 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., White J.S., Hase M., Yasui Y.,
Project Exploration of emerging magnetoelectric coupling effects in new materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 101(14)
Page(s) 140408 - 140408
Title of proceedings Physical Review B
DOI 10.1103/physrevb.101.140408

Open Access

Type of Open Access Repository (Green Open Access)


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.