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Paper detail

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

We report experimental and theoretical evidence that Rb$_2$Cu$_2$Mo$_3$O$_{12}$ 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 novel class of ferroelectricity induced by a vector spin chirality order.

preprint2020arXivOpen access
Hiroshi UedaShigeki OnodaYasuhiro YamaguchiTsuyoshi KimuraDaichi YoshizawaToshiaki MoriokaMasayuki HagiwaraMasato HagihalaMinoru SodaTakatsugu MasudaToshiro SakakibaraKeisuke TomiyasuSeiko Ohira-KawamuraKenji NakajimaRyoichi KajimotoMitsutaka NakamuraYasuhiro InamuraN. ReynoldsM. FrontzekJ. S. WhiteMasashi HaseYukio Yasui
cond-mat.str-el
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Hiroshi UedaShigeki OnodaYasuhiro YamaguchiTsuyoshi KimuraDaichi YoshizawaToshiaki MoriokaMasayuki HagiwaraMasato HagihalaMinoru SodaTakatsugu MasudaToshiro SakakibaraKeisuke TomiyasuSeiko Ohira-KawamuraKenji NakajimaRyoichi KajimotoMitsutaka NakamuraYasuhiro InamuraN. ReynoldsM. FrontzekJ. S. WhiteMasashi HaseYukio Yasui

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