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000020759 084__ $$2WoS$$aPhysics, Condensed Matter
000020759 1001_ $$0P:(DE-HGF)0$$aAlekseev, P.A.$$b0
000020759 245__ $$aInterplay of low-energy phonons and magnetiv excitations in the Kondo insulator YbB12
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000020759 440_0 $$03703$$aJournal of Physics: Condensed Matter$$v24$$x0953-8984$$y20
000020759 500__ $$aWe are grateful to D Reznik for fruitful discussions and to the LLB and ILL for hospitality during the experiments. Financial support from RFBR grants 08-02-00430 and 11-02-00121 is highly appreciated.
000020759 520__ $$aPeculiarities in the lattice dynamics of the Kondo insulator Y bB(12) have been studied by inelastic neutron scattering. Selected phonon modes were traced above and below the temperature region (T ~ 50 K) where the gap opens in the electron density of states. The intensities of some low-energy modes exhibit an anomalous temperature dependence for q vectors close to the Brillouin zone boundary, suggesting a renormalization of the phonon eigenvectors. This effect is thought to arise from a coupling with magnetic excitations of the same symmetry, which exist at nearby energies. It is argued that this magnetovibrational coupling may in turn play a role in the steep temperature crossover existing in Y bB(12) between the low-temperature (Kondo insulator) and high-temperature (incoherent spin-fluctuation) regimes, which is rapidly suppressed by lighter Zr substitution.
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000020759 7001_ $$0P:(DE-HGF)0$$aMignot, J.-M.$$b1
000020759 7001_ $$0P:(DE-Juel1)141702$$aNemkovski, K.S.$$b2$$uFZJ
000020759 7001_ $$0P:(DE-HGF)0$$aRybina, A.V.$$b3
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000020759 7001_ $$0P:(DE-HGF)0$$aTakabatake, T.$$b7
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