Raman-scattering results from Y1-xCaxSr2Cu2GaO7

D. Salamon, R. Liu, M. V. Klein, D. A. Groenke, Kenneth R Poeppelmeier, B. Dabrowski, P. D. Han, D. A. Payne

Research output: Contribution to journalArticle

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Abstract

We present a Raman-scattering study of Y1-xCaxSr2Cu2GaO7 for both the x=0 parent compound and doped compositions with x=0.25 and x=0.40. Extrapolation from YBa2Cu3O7-d and other cuprates allows us to assign many of the Raman-active phonon modes in the x=0 material, as well as identify a two-magnon scattering peak, a second-order phonon scattering peak, and a Raman continuum out to 4000 cm-1. Despite compositional inhomogeneities, the doped superconducting samples show some of the same low-energy phonon features as the x=0 material. There is, however, a doping-dependent shift in the positions of features in the 500-700 cm-1 range, possibly due to Ca locating on Sr sites instead of Y sites. The relative intensities of the phonon peaks in the doped material are also changed from the insulator (x=0), suggesting that a resonant Raman phenomenon is occurring. The temperature-dependent spectra show what appears to be a superconducting dip in the background intensity, but the low superconducting fractions in these samples make this difficult to verify. The doped material also has a Raman continuum out to 4000 cm-1 just as in the x=0 samples, but with the two-magnon and second-order phonon scattering peaks significantly reduced in intensity. This may be a result of changes in the long-range ordering, or another manifestation of the same resonance phenomena occurring at lower energies. Single-crystal samples of the doped material Y1-xCaxSr2Cu2GaO7 are necessary for a more conclusive Raman study.

Original languageEnglish
Pages (from-to)12242-12247
Number of pages6
JournalPhysical Review B
Volume47
Issue number18
DOIs
Publication statusPublished - 1993

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Raman scattering
Raman spectra
Phonon scattering
scattering
continuums
cuprates
extrapolation
inhomogeneity
Extrapolation
insulators
Doping (additives)
energy
Single crystals
Scattering
shift
single crystals
Chemical analysis
temperature
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Salamon, D., Liu, R., Klein, M. V., Groenke, D. A., Poeppelmeier, K. R., Dabrowski, B., ... Payne, D. A. (1993). Raman-scattering results from Y1-xCaxSr2Cu2GaO7. Physical Review B, 47(18), 12242-12247. https://doi.org/10.1103/PhysRevB.47.12242

Raman-scattering results from Y1-xCaxSr2Cu2GaO7. / Salamon, D.; Liu, R.; Klein, M. V.; Groenke, D. A.; Poeppelmeier, Kenneth R; Dabrowski, B.; Han, P. D.; Payne, D. A.

In: Physical Review B, Vol. 47, No. 18, 1993, p. 12242-12247.

Research output: Contribution to journalArticle

Salamon, D, Liu, R, Klein, MV, Groenke, DA, Poeppelmeier, KR, Dabrowski, B, Han, PD & Payne, DA 1993, 'Raman-scattering results from Y1-xCaxSr2Cu2GaO7', Physical Review B, vol. 47, no. 18, pp. 12242-12247. https://doi.org/10.1103/PhysRevB.47.12242
Salamon D, Liu R, Klein MV, Groenke DA, Poeppelmeier KR, Dabrowski B et al. Raman-scattering results from Y1-xCaxSr2Cu2GaO7. Physical Review B. 1993;47(18):12242-12247. https://doi.org/10.1103/PhysRevB.47.12242
Salamon, D. ; Liu, R. ; Klein, M. V. ; Groenke, D. A. ; Poeppelmeier, Kenneth R ; Dabrowski, B. ; Han, P. D. ; Payne, D. A. / Raman-scattering results from Y1-xCaxSr2Cu2GaO7. In: Physical Review B. 1993 ; Vol. 47, No. 18. pp. 12242-12247.
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