Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3

Details Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3 Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3

1997-12-16

arxiv.org/abs/cond-mat/9712191v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages (RevTex), 3 figures (encapsulated postscript)

Scientific paper

10.1063/1.367634

Cold neutron triple-axis measurements have been used to investigate the nature of the long-wavelength spin dynamics in strongly-doped La$_{1-x}$Sr$_{x}$MnO$_3$ single crystals with $x$=0.2 and 0.3. Both systems behave like isotropic ferromagnets at low T, with a gapless ($E_0 < 0.02$ meV) quadratic dispersion relation $E = E_0 + Dq^2$. The values of the spin-wave stiffness constant $D$ are large ($D_{T=0}$ = 166.77 meV$ \AA^2$ for $x$=0.2 and D$_{T=0}$ = 175.87 meV$ \AA^2$ for $x$=0.3), which directly shows that the electron transfer energy for the $d$ band is large. $D$ exhibits a power law behavior as a function of temperature, and appears to collapse as T -> T_C. Nevertheless, an anomalously strong quasielastic central component develops and dominates the fluctuation spectrum as T -> T_C. Bragg scattering indicates that the magnetization near $T_C$ exhibits power law behavior, with $\beta \simeq 0.30$ for both systems, as expected for a three-dimensional ferromagnet.

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