Infrared and electron spin resonance for the high temperature superconductor Y1Ba2Cu3O(9-x)

Samples of the high temperature superconductor Y-Ba-Cu-O were prepared to achieve the oxygen deficient perovskite structure Y1Ba2Cu3O(9-x) with x greater than 2. The electrical resistance has been measured with the temperature in the range from 77 to 300 K, under the application of dc and ac with frequency 900 Hz. The dc produced a rather lower critical temperature Tc with zero resistance at 77.1 K, but the ac gave a sharp drop in the resistance but zero resistance was reached at liquid nitrogen temperature. To elucidate this behavior, an XRD pattern was obtained. An IR analysis was carried out for the sample and the starting materials to provide more information about the bonds. To complete the picture, electron spin resonance study is discussed.