Electric Resistivity of PrBa_2Cu_3O_(7-x) Polycrystals

摘要

We have studied differences of electrical transports, magnetic properties and crystal structures between superconducting Pr123 single crystals and nonsuperconducting crystals. We synthesized Pr123 polycrystals under low partial pressure of oxygen. These samples show nearly metallic temperature dependence of resistivity. We suggest that in Pr123 crystals, atomic disordering and/or deficiencies influence on electrical transport property and cause insulating behaviour, so the disordering of Pr and Ba is important to suppression of superconductivity in Pr123 compounds.