Softening and Broadening of the Zone Boundary Magnons in Pr0.63Sr0.37MnO3

Abstract

We have studied the spin dynamics in Pr${}_{0.63}$Sr${}_{0.37}$MnO${}_3$ above and below the Curie temperature $T_C=301$ K. Three distinct new features have been observed: a softening of the magnon dispersion at the zone boundary for $T<T_C$, significant broadening of the zone boundary magnons as $T\to T_C$, and no evidence for residual spin-wave like excitations just above $T_C$. The results are inconsistent with double exchange models that have been successfully applied to higher $T_C$ samples, indicating an evolution of the spin system with decreasing $T_C$.

12 pages, Latex, 3 figures

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