Charge-imbalance fluctuations in superconductors

Charge Fluctuation in the High Tc Superconductor YBaCuO in the Transition Temperature Region

“…So the relaxation time of charge fluctuations is much longer, see (S), when the temperature is close to the transition point of superconductivity [9]. On the other hand, the positron lifetime in a solid is known to be 10-lo s. Thus the positrons can annihilate in the charge imbalance region, and in turn, the instantaneous nonequilibrium information of the electronic structure in the superconductor a t the temperature To can be detected by positron annihilation lifetime measurements.…”