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Observation of acoustic magneto-chiral anisotropy in $α$-quartz

M. Altangerel, S. Badoux, C. Proust, D. Vignolles, G. L. J. A. Rikken

Abstract

We report the experimental observation of magneto-chiral anisotropy in the longitudinal and transverse ultrasound propagation in $α$-quartz. To perform such measurement, we have built an ultrasound spectrometer with unprecedented experimental resolution of the order of $Δv/v \sim 10^{-8}$. We present a simple macroscopic Becquerel-like analytical model that accounts for the magnitude of the observed effect and its frequency dependence.

Observation of acoustic magneto-chiral anisotropy in $α$-quartz

Abstract

We report the experimental observation of magneto-chiral anisotropy in the longitudinal and transverse ultrasound propagation in -quartz. To perform such measurement, we have built an ultrasound spectrometer with unprecedented experimental resolution of the order of . We present a simple macroscopic Becquerel-like analytical model that accounts for the magnitude of the observed effect and its frequency dependence.

Paper Structure

This paper contains 7 equations, 3 figures.

Figures (3)

  • Figure 1: Schematic view of the ultrasound interferometer. RF switches S1, S2 and S3 direct RF excitation pulses towards the ZnO transducers T1 and T2, or the transmitted signals from the transducers to a differential amplifier (the situation shown).
  • Figure 2: aMChA for longitudinal (blue) and transverse (red) waves in L (full) and D (open) $\alpha$-quartz crystals. Symbols: circles (L-long, 481 MHz), squares (L-trans, 352 MHz), triangles (D-long, 340 MHz), and pentagons (D-trans, 325 MHz). Solid lines are linear fits. Vertical bars indicate typical uncertainties.
  • Figure 3: Frequency dependence of the aMChA field slope for longitudinal (blue) and transverse (red) waves in L (full) and D (open) $\alpha$-quartz crystals. Symbols: circles (L-long), triangles (D-long), and pentagons (D-trans). Solid lines are linear fits to the longitudinal and transverse datasets. Vertical bars indicate typical uncertainties.