Abstract
We have studied the magnetic interactions of single-crystalline ${\mathrm{CePd}}_{2}{\mathrm{Si}}_{2}$ by measurements of the electrical resistivity, specific heat, thermal expansion, magnetic susceptibility, and elastic and inelastic neutron scattering. In the paramagnetic phase the system is characterized by Kondo-type spin fluctuations which give rise to a strong quasielastic signal in the inelastic neutron scattering cross section. Below the antiferromagnetic ordering temperature ${(T}_{N}=8.5$ K), the quasielastic signal coexists with spin-wave excitations. The spin waves are strongly dispersive, with a minimum energy of 0.83 meV at the magnetic zone center $\mathbf{k}=(1/2,1/2,0).$ The dispersion can be described in terms of a two-sublattice model with a reduced magnetic exchange interaction and a strong damping of the spin waves due to Kondo screening. The volume dependence of the magnetic interactions has been analyzed using the Gr\"uneisen parameters in order to study the magnetic interactions close to the quantum critical point, which is reached at an applied pressure of about 30 kbar.
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