Occurrence of superconductivity in Ba-doped NdSr2(Cu,Mo)3Oz

초록

Polycrystalline samples of Nd(Sr2-yBay)(Cu3-xMox)O-z (0 less than or equal to y less than or equal to 0.5, 0.1 less than or equal to x less than or equal to 0.3) with tetragonal structure were synthesized and investigated by powder X-ray diffraction, electrical resistivity, magnetic susceptibility and thermoelectric power measurements. Contrary to the absence of superconductivity of the Ba-free samples, superconductivity can be achieved by partially substituting Ba for Sr in semiconducting NdSr2(Cu3-xMox)O-z (0.15 less than or equal to x less than or equal to 0.3). Thermoelectric power measurements reveal that all the samples are in the underdoped state and the partial substitution of Ba for Sr results in an increase of the carrier density on the superconducting layers.

키워드