Elastic constants of a single-impurity model with the Γ8 ground state is studied with particular attention to the anisotropy induced by external magnetic field. We calculate elastic constants C66 and C44 taking account of deformations to second order. Under external magnetic field, field-induced quadrupole moments affect elastic constants through the coupling with second-order terms of deformations. It is shown, with an appropriate choice of coupling parameters, that the C66 decreases with increasing magnetic field parallel to the (001)-axis. This single-ion model can also explain the splitting of the C44-modes observed in ultrasonic measurement of Ceo.5La0.5B6.
- Elastic constants
- Field-induced quadrupole moment
- Single-impurity model
- The second-order deformations
- The Γ-subspace
ASJC Scopus subject areas
- Physics and Astronomy(all)