Date of Award
1990
Document Type
Thesis
Publication Status
Version of Record
Submission Date
October 2026
Thesis/Dissertation Advisor [Chair]
Liu, Da Wei
Abstract
Polycrystalline bulk samples with the chemical formula YBa2(Cu1-xFex)3O7+delta were fabricated by the standard solid-state reaction method, and studied through magnetic susceptibility and Raman scattering experiments. In the Raman experiments, the Cu(1)-O(1) c-axial Ag stretching mode at ~502cm^-1 was investigated extensively at temperatures ranging from 23K to 773K. The room-temperature Raman spectra indicated a trend for saturation in frequency shift (as a function of iron concentration). This was interpreted as evidence supporting the occurrence of a type of iron clustering in the (001) basal plane. Effects of such a cluster formation upon the mechanism of superconductivity were considered. The low temperature Raman spectra show that the 502cm^-1 mode frequency increased slightly with decreasing temperature for all of the studied values of iron concentration without exhibiting any anomalous behavior. In the high temperature Raman spectra, a significant softening of the 502cm^-1 mode, indicative of a phase transition onset, was observed.
Extent
127 p.
Recommended Citation
Tanabe, Makoto., "Raman spectroscopic study of yttrium barium(2)(copper(1-x)iron(x))oxygen(7+delta)" (1990). Electronic Theses and Dissertations 1990 - 1999. 98.
https://digitalcommons.fau.edu/etd_general_4/98
Identifier
FADT14597
Comments
FAU Electronic Theses and Dissertations Collection|Thesis (M.S.)--Florida Atlantic University, 1990.|Charles E. Schmidt College of Science|FAU Electronic Theses and Dissertations Collection