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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/10872

Title: FREQUENCY-SHIFTS OF OPTICAL PHONONS DUE TO SIZE-EFFECT INDUCED CHARGE-TRANSFER IN TL(BA1-XSRXLA)CUO5
Authors: MERTELJ, T
SUNDARESAN, A
GUPTA, LC
SHARON, M
MIHAILOVIC, D
Keywords: raman
superconductivity
tl
Issue Date: 1993
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: SOLID STATE COMMUNICATIONS, 88(4), 271-274
Abstract: Raman-scattering and infrared-absorption spectra of optical phonons in the ceramic Tl(Ba1-xSrxLa)CuO5 oxide superconductor that contains a single Tl-O and Cu-O layers are reported as functions of Sr content. Replacing Ba-ions by isovalent Sr-ions leads to remarkable changes in the electronic and superconducting properties of these materials. As a consequence of the charge transfer from the TlO to the CuO2 plane (by a redox mechanism), the Raman-active apical-oxygen phonon at 526 cm-1 and the 623 cm-1 IR-active phonon (associated with the TlO-plane oxygen ions) show respectively an approximately 18 cm-1 and a approximately 20 cm-1 frequency increase with increasing x. The changes in the Raman-active phonon linewidth with increasing x are attributed to a decreasing disorder due to the smaller ionic radii mismatch in the Ba site.
URI: http://dx.doi.org/10.1016/0038-1098(93)90506-I
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10872
http://hdl.handle.net/10054/10872
ISSN: 0038-1098
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