Abstract
The low-energy magnetic excitations of the noncentrosymmetric heavy-fermion superconductor ${\text{CePt}}_{3}\text{Si}$ have been measured with inelastic neutron scattering on a single crystal. Kondo-type spin fluctuations with an anisotropic wave-vector dependence are observed in the paramagnetic state. These fluctuations do not survive in the antiferromagnetically ordered state below ${T}_{N}=2.2\text{ }\text{K}$ but are replaced by damped spin waves, whose dispersion is much stronger along the $c$ axis than in other directions. No change is observed in the excitation spectrum or the magnetic order as the system enters the superconducting state below ${T}_{c}\ensuremath{\approx}0.7\text{ }\text{K}$.
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