Crystallographic and physical properties of new orthorhombic Cu-1212 R(Ba2-xR'x)Cu3O7+y system (R,R'=La,Pr,Nd; 0.65<x<1)
- Lin, B.N.
DOI Publisher
ElsevierAbstract
[[abstract]]Structural, magnetic, calorimetric and transport results are reported for the new orthorhombic Cu-1212 R(Ba2-xR'x)Cu2O7+y cuprates (R,R'x=La,Pr,Nd; 0.650.2), the anomalous Pr ordering temperature TN(Pr) decreases sharply from 18 K for O(I)-phase PrBa2Cu3O7 (space group Pmmm, a0<b~0.39 nm and c~1.17 nm), to 5.5 K for Pr(Ba1.3Pr0.7)Cu3O7.25 and 6 K for Pr(Ba1.3La0.7)Cu3O7.29. The dramatically decreasing TN(Pr) is closely related with longer Pr-O bond length in the O(II)-phase which effectively decreases Pr 4f-O 2pz orbital hybridization. No superconductivity was observed for these new insulating cuprates[[fileno]]2010102010080[[department]]物理
Add to ORKG