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Inelastic neutron scattering (INS) is employed to study damped spin-waveexcitations in the noncentrosymmetric heavy-fermion superconductor CePt3Sialong the antiferromagnetic Brillouin-zone boundary in the low-temperaturemagnetically ordered state. Measurements along the (1/2 1/2 L) and (H H 1/2-H)reciprocal-space directions reveal deviations in the spin-wave dispersion fromthe previously reported model. Broad asymmetric shape of the peaks in energysignifies strong spin-wave damping by interactions with the particle-holecontinuum. Their energy width exhibits no evident anomalies as a function ofmomentum along the (1/2 1/2 L) direction, which could be attributed toFermi-surface nesting effects, implying the absence of pronounced commensuratenesting vectors at the magnetic zone boundary. In agreement with a previousstudy, we find no signatures of the superconducting transition in the magneticexcitation spectrum, such as a magnetic resonant mode or a superconducting spingap, either at the magnetic ordering wavevector (0 0 1/2) or at the zoneboundary. However, the low superconducting transition temperature in thismaterial still leaves the possibility of such features being weak and thereforehidden below the incoherent background at energies ~0.1 meV, precluding theirdetection by INS.

Dispersion and damping of zone-boundary magnons in the noncentrosymmetric superconductor CePt3Si