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COMPARATIVE-ANALYSIS OF THE MOSSBAUER-SPECTRA OF YBA2(CU0.99FE0.01)3O7-DELTA WITH STATIC DISTRIBUTION AND RELAXATION MODELS

PANKHURST, QA; SUHARAN, S; THOMAS, MF; (1992) COMPARATIVE-ANALYSIS OF THE MOSSBAUER-SPECTRA OF YBA2(CU0.99FE0.01)3O7-DELTA WITH STATIC DISTRIBUTION AND RELAXATION MODELS. J PHYS-CONDENS MAT , 4 (13) 3551 - 3558.

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Abstract

The low-temperature Fe-57 Mossbauer spectra of superconducting samples of Fe-substituted YBa2Cu3O7-delta containing less than approximately 5 at.% Fe are characterized by a broad magnetically split profile. Although there is consensus in the literature as to the shape of this spectrum, there is no consensus of interpretation. Comparison of the fits obtained for two samples with 1% Fe substitution using (i) a hyperfine-field distribution model and (ii) a dynamic relaxation model demonstrates that the distribution model is marginally better, but that the relaxation model cannot be reliably discounted on the basis of the low-temperature Mossbauer data alone.

Type: Article
Title: COMPARATIVE-ANALYSIS OF THE MOSSBAUER-SPECTRA OF YBA2(CU0.99FE0.01)3O7-DELTA WITH STATIC DISTRIBUTION AND RELAXATION MODELS
Keywords: CRYSTAL-STRUCTURE, OXIDES
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/59427
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