Abstract
By combining x-ray diffraction (XRD), x-ray photoemission spectroscopy (XPS) andAC susceptibility measurements we investigate the evolution of structural andsuperconducting properties of La-doped Bi-2201 thin films grown by pulsed laser deposition(PLD) under different annealing conditions. We find that the main effect of oxygenannealing is to improve the crystal coherence by enabling La cation migrationto the Sr sites. This activates the desired hole doping. Short-time Ar annealingremoves the interstitial oxygen between the BiO layers, fine adjusting the effectivehole doping. The superconducting critical temperature is consequently enhanced.However, longer annealings result in phase separation and segregation of thehomologous compound Bi-1201. We attribute this effect to the loss of Bi during theannealing.
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