CHARACTERIZATION OF POTASSIUM-DOPED GDBA2CU3O7-DELTA USING RAMAN-SPECTROSCOPY AND X-RAY-DIFFRACTION

Potassium doped and undoped GdBa(2)Cu3O(7-delta) have been prepared an d superconducting transition temperatures between 92 K and 100 K have been determined from resistivity measurements. Raman spectra of doped and undoped samples are identical and they contain bands corresponding to both the superconducting orthorhombic phase and nonsuperconducting tetragonal phase. XRD patterns also reveal both the phases. Raman spe ctra recorded at 92 K of undoped GdBa2Cu3O7-delta and doped GdBa2Cu3O7 -delta with weight percentages 0.75, 1.00, 1.25 and 1.50 of K shows a softening of the band at 338 cm(-1).