Low energy excitations in Tb2Ti2O7 spin liquid in applied field: evidence of a local symmetry breaking
Understanding the spin liquid ground ste of Tb2Ti2O7 has been one of the main challenges in geometrically frustrated magnets for more than a decade. We recently proposed an explanation based on a local symmetry breaking by a Jahn-Teller distortion. Our model is supported by extended mean field calculation which reproduce well our INS data in zero field, together with IN5 data on Tb2Sn2O7 ordered spin ice. The best way to check this model is to measure the low energy excitation (around 0.1-0.2 meV), related to the degeneracy lifting of the ground state doublet by the distortion, in applied field through out the quantum critical point (H=2T). Our first attempt on IN5 was only partly sucessful, showing the strong effect of the field on the INS spectrum, but failing to measure the low energy region due to a strong background. We propose to repeat this experiment in better conditions, order to give a definite answer to this question.
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I. MIREBEAU; BONVILLE Pierre; GUITTENY Solene; MUTKA Hannu; OLLIVIER Jacques; PETIT Sylvain and ROBERT Julien. (2013). Low energy excitations in Tb2Ti2O7 spin liquid in applied field: evidence of a local symmetry breaking. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1702
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