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Effect of Sr and Co doping on structure and phonon raman spectra of YBa2Cu3O7-d

✍ Scribed by Masato Kakihana; Lars Börjesson; Sten Eriksson

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
215 KB
Volume
165-166
Category
Article
ISSN
0921-4526

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✦ Synopsis

The effect of cosubstitution of Sr for Ba and Co for Cu in the superconductor YBa2-,Sr,Cu3-.CO.07-d on Raman spectra and relevant bond distances deduced with neutron diffraction measurements has been investigated. Specifically the 0(4) stretching 500 cm-1 Raman frequency shifts, on the one hand. upward upon Sr doping. on the other hand downward upon Co doping. The net effect is inter~reted by a weakening of the net force constant for the 0{4) atom involving both the Cu(1)-0(4) and Cu(2)-0(4) bonds, and the 0(4) s~retch~ng .vi brat ion is found. to ~ystematically change with the Cu(l)-Cu(2) bond distance. A brief d1Scusslon 1S made on the relat10nshlp between Tc and the structural changes induced by the dopants.

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