Periodicity Change in Structural Modulation in Bi₂Sr₂Ca_1-yRE_yCu₂O_8+δ (RE=Y, Nd) System

Abstract

Changes in structural modulation for the Bi2Sr2Ca1-y RE y Cu2O8+δ system (RE=Y, Nd), accompanied with the transition from the superconductor to the antiferromagnetic insulator, were examined. In the Bi2Sr2Ca1-y Y y Cu2O8+δ system, the modulation periodicity continuously decreased, from about 5.0 times to 4.0 times the length of the subcell along the b axis, with increasing Y content substituted. The modulation periodicity for Bi2Sr2NdCu2O8+δ was about 4.0 times the length of the subcell along the b axis, the same as in the Bi2Sr2YCu2O8+δ. This decrease in the modulation periodicity is attributed to the valence change of Y3+ for Ca2+.

Structural modulation on multilayered bismuth cuprate observed by x-ray reciprocal space mapping

“…Regarding the origin of the SC structure, the intercalation of extra oxygen in BiO layer has been studied, 1,2,11,13 and the extra oxygen model seems to be widely accepted in several proposed models. Among those studies, the interca-lation was carried out by aliovalent substitution such as the partial substitution of La 3+ for Sr 2+ , Pb 2+ for Bi 3+ , 1,2 or 3d metals for Cu, 14 etc.…”

Structural modulation in bismuth cuprate superconducting film with continuous epitaxial growth

“…Reciprocal space of such structure shows satellite peaks around the main reflection generated by unit cell structure. While symmetric fourfold satellites in intensity and distribution have been observed on single crystal [1][2][3][4][5][6][7][8][9], asymmetric satellite peaks were observed by X-ray reciprocal space mapping (XRSM) on epitaxial thin film [10][11][12].…”

Structural modulation in bismuth cuprate superconductor observed by X-ray reciprocal space mapping

“…Many studies have been reported on single crystal using high-resolution electron microscopy, electron diffraction, X-ray diffraction (XRD), and neutron diffraction on single crystal samples [1][2][3][4][5][6][7][8][9][10][11]. However, detailed studies have not been reported on epitaxial film.…”