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

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arxiv cond-mat/9710157 v1 pith:S3INQRZV submitted 1997-10-15 cond-mat.str-el

H.Y. Hwang , P. Dai , S-W. Cheong , G. Aeppli , D.A. Tennant , H.A. Mook This is my paper · ORCID
classification cond-mat.str-el
keywords boundaryzoneabovebeenbroadeningmagnonssofteningspin
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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 $T_C$.

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