Spin dynamics in Yb2Ti2O7
We propose to measure the magnetic excitations in Yb2Ti2O7. This highly frustrated magnet shows a transition towards a ferromagnetic state, recently interpreted as a Higgs transition from a magnetic Coulomb liquid to a ferromagnet. Recent data collected at LLB provide evidence for unconventional excitations, very broad in energy, reminiscent of a continuum rather than well defined spin-wave-like excitations. Actually, theoretical predictions argue that such spectra could be the signature of a spinon continuum with a signature in the <S+S-> response function. We propose to carry out a polarized neutron study to check this prediction.
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ROBERT Julien; DECORSE Claudia; GUITTENY Solene; LHOTEL Elsa; I. MIREBEAU; PETIT Sylvain and STEFFENS Paul. (2015). Spin dynamics in Yb2Ti2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1452
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