Metallic Behavior for Normal State Resistivity of PrBa2-xRxCu3O7 Compounds

Abstract:

The present work investigates the effect of R substitution at the Ba site on structural and transportproperties of PrBa2-xRxCu3O7 compound (R = Er, Gd, Nd, La & x = 0.00, 1.5). The samples are examined by usingXRD, resistivity and Hall coefficient measurements. The results of XRD indicate that the structure of the samples

with (x = 0 and R = Er, Gd, and La) are quasi-tetragonal, while the sample with R = Nd is orthorhombic. Further,some of undefined lines could be observed in the XRD patterns of (R = Er, Gd, Nd and La) as compared to Pr: 123sample. Interestingly the substitution of R at the Ba site leads to unusual drop in the normal state resistivity ascompared to Pr:123 compound. Similar behavior is recorded for the carrier concentration against R plot. These

results suggested that the hole filling might be the key parameter controlling the absence of superconductivity of Pr:123 compound.