Abstract
The magnetoacoustic interaction for field $\stackrel{\ensuremath{\rightarrow}}{H}$ normal to propagation vector $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}$ has been studied in high-purity niobium at frequencies extending to 650 and 430 MHz for longitudinal and transverse waves, respectively. Fermi-surface calipers determined for $\stackrel{\ensuremath{\rightarrow}}{\mathrm{q}}\ensuremath{\parallel}[100]$ and $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\epsilon}}\ensuremath{\parallel}[010]$ agree within about 2% with the augmented-plane-wave theoretical values for the distorted ellipsoids. Also, an interesting and useful "caliper-selectivity" mechanism operative in the transverse-wave case was observed which, for particular orientations of wave polarization $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\epsilon}}$, served to isolate individual calipers so that the calipers corresponding to a single Fermi sheet were swept out as $\stackrel{\ensuremath{\rightarrow}}{H}$ was rotated through 360\ifmmode^\circ\else\textdegree\fi{}. The corresponding presence of a single period in the oscillations at all field angles permitted relaxation of the number of oscillations required for precise determination of the electron momenta.
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