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Relaxation of the Superconducting Order Parameter

1967; American Institute of Physics; Volume: 154; Issue: 2 Linguagem: Inglês

10.1103/physrev.154.349

1536-6065

Georgina Lucas, M. J. Stephen,

Magnetic and transport properties of perovskites and related materials

The creation and annihilation of quasiparticles in a superconductor through their interaction with the phonon field is examined. At low frequencies this appears to be the main mechanism leading to relaxation of the order parameter in a superconductor. The relaxation time becomes long both close to ${T}_{c}$ and at low temperatures. Close to ${T}_{c}$, a diffusion equation for the order parameter is obtained. The correlation in time of the fluctuations of the order parameter is examined. A weak coupling between the amplitude and phase of the order parameter is shown to lead to a slow diffusion of the phase of the order parameter.