Nonlinear evolution of shear-polarized acoustic pulses in metals

The evolution of strong acoustic pulses in metals due to electromagnetic interaction of resonance electrons with lattice deformations is studied. It is assumed that the pulse length L is much shorter than the mean free path of carriers l but considerably longer than the characteristic attenuation depth λ e of the electromagnetic field in the conductor in the anomalous skin effect. It is also assumed that the amplitude of sound is quite large so that the electron relaxation time τ p is much longer than the time of transit of resonance electrons across the pulse region L/υ (υ denotes the characteristic velocity of resonance particles). The electromagnetic eddy field corresponding to various types of crystal deformation is obtained by solving the transport equation in conjunction with the Maxwell's equation