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  • Title: Interplay of low-energy phonons and magnetic excitations in the Kondo insulator YbB12.
    Author: Alekseev PA, Mignot JM, Nemkovski KS, Rybina AV, Lazukov VN, Ivanov AS, Iga F, Takabatake T.
    Journal: J Phys Condens Matter; 2012 May 23; 24(20):205601. PubMed ID: 22510752.
    Abstract:
    Peculiarities 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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