Stability for thermoelastic plates with two temperatures

We investigate the well-posedness, the exponential stability, or the lack thereof, of thermoelastic systems in materials where, in contrast to classical thermoelastic models for Kirchhoff type plates, two temperatures are involved, related by an elliptic equation. The arising initial boundary value problems for different boundary conditions deal with systems of partial differential equations involving Schrödinger like equations, hyperbolic and elliptic equations, which have a different character compared to the classical one with the usual single temperature. Depending on the model – with Fourier or with Cattaneo type heat conduction – we obtain exponential resp. non-exponential stability, thus providing another examples where the change from Fourier’s to Cattaneo’s law leads to a loss of exponential stability.