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We have studied the spin dynamics in Pr$_{0.63}$Sr$_{0.37}$MnO$_3$ above andbelow the Curie temperature $T_C=301$ K. Three distinct new features have beenobserved: a softening of the magnon dispersion at the zone boundary for$T<T_C$, significant broadening of the zone boundary magnons as $T\to T_C$, andno evidence for residual spin-wave like excitations just above $T_C$. Theresults are inconsistent with double exchange models that have beensuccessfully applied to higher $T_C$ samples, indicating an evolution of thespin system with decreasing $T_C$.Comment: 12 pages, Latex, 3 figure

physical review letters

Softening and Broadening of the Zone Boundary Magnons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.63</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.37</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow…

Softening and Broadening of the Zone Boundary Magnons inPr0.63Sr0.37MnO3