Antiferromagnetic Resonance in RbMn $F_{3}$ Under Axial Stress

Magnetoelastic constants of antiferromagnetic RbMn

F_{3}

were determined at 4.2°K from the stress and field dependence of AFMR frequency:

b_{1} = 1.5 \times 10^{6}

and

b_{2} = 0.17 \times 10^{6}

erg/

{cm}^{3}

; linewidths are accounted for by inhomogeneous strain broadening. Spin-lattice strain coefficients for

{Mn}^{+ +}

in a regular

F^{-}

octahedron were derived as

G_{11} = 0.32

and

G_{44} = - 0.073

(

{cm}^{- 1}

/ion) after correcting the

b' s

for magnetic dipolar contributions.

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Antiferromagnetic Resonance in RbMnF3Under Axial Stress