Raman Studies of Orthorhombic YBa_<2-x>Sr_xCu_3O_<7-y>

概要

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A Raman scattering study was performed in orthorhombic YBa_<2-x>Sr_xCu_3O_<7-y> at room temperature. It is found that the Raman peak associated with Cu-O-Cu stretching mode along the c-axis (502 nm^<-1>, x=0) increases continuously in frequency with increasing Sr content, while the bending mode of the Cu-O (341 cm^<-1>, x=0) decreases in frequency. These results indicate that larger contraction of the Cu-O-Cu bond distance along the c-axis than that of the lattice constant along the c-axis of the orthorhombic unit cell can be attained by replacing Ba sites with Sr ions.
社団法人応用物理学会の論文
1989-07-20