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Composition dependence of the spin wave stiffness parameter in La(sub 1-x)Ca(sub x)MnO(sub 3) CMR materials.

DE2001757538

Publication Date	2000
Personal Author	Rhyne, J. J.; Kaiser, H.; Stumpe, L.; Mitchell, J. F.; Mccloskey, T.; Chourasia, A. R.
Page Count	9
Abstract	Long wavelength spin waves in La(1-x)Ca(x)MnO(3)CMR materials exhibit conventional Heisenberg dispersion (E = D1(sup 2) + delta), but with an anomalous temperature dependence for the spin dispersion parameter D. For x approx. 0.33, near the optimum CMR composition, D remains approximately 50% of its T = 0K value before exhibiting a near-first-order transition at T(sub c), instead of following the expected power law decrease as T approaches T(sub c-). No temperature hysteresis was observed in either D or in the magnetization. Compositions with x = 0.40 and 0.45 show more conventional temperature renormalization.
Keywords	Spin waves Lanthanum oxides Calcium oxides Magnetic materials Chemical composition Flexibility Manganese oxides
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-31-109-ENG-38

Composition dependence of the spin wave stiffness parameter in La(sub 1-x)Ca(sub x)MnO(sub 3) CMR materials.

Composition dependence of the spin wave stiffness parameter in La(sub 1-x)Ca(sub x)MnO(sub 3) CMR materials.
DE2001757538

Publication Date	2000
Personal Author	Rhyne, J. J.; Kaiser, H.; Stumpe, L.; Mitchell, J. F.; Mccloskey, T.; Chourasia, A. R.
Page Count	9
Abstract	Long wavelength spin waves in La(1-x)Ca(x)MnO(3)CMR materials exhibit conventional Heisenberg dispersion (E = D1(sup 2) + delta), but with an anomalous temperature dependence for the spin dispersion parameter D. For x approx. 0.33, near the optimum CMR composition, D remains approximately 50% of its T = 0K value before exhibiting a near-first-order transition at T(sub c), instead of following the expected power law decrease as T approaches T(sub c-). No temperature hysteresis was observed in either D or in the magnetization. Compositions with x = 0.40 and 0.45 show more conventional temperature renormalization.
Keywords	Spin waves Lanthanum oxides Calcium oxides Magnetic materials Chemical composition Flexibility Manganese oxides
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200123
Contract Number	W-31-109-ENG-38