Large-shift Raman scattering features in superconducting YB2Cu3O6+x
- Authors
- Salamon D.; Abbamonte P.; Liu, Ran; Klein M.; Lee, Won Choon; Ginsberg D.; Tartakovskii I.; B. W. Veal
- Issue Date
- Jan-1996
- Publisher
- American Physical Society
- Citation
- Physical Review B - Condensed Matter and Materials Physics, v.53, no.2, pp 886 - 891
- Pages
- 6
- Journal Title
- Physical Review B - Condensed Matter and Materials Physics
- Volume
- 53
- Number
- 2
- Start Page
- 886
- End Page
- 891
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/150652
- DOI
- 10.1103/PhysRevB.53.886
- ISSN
- 0163-1829
- Abstract
- We apply the large-shift Raman-scattering technique to explore the metal-insulator transition in YBa 2 Cu 3 O 6 + x . In a doping-dependence study for x∼0 to 1, we find that the previously observed A 2 g scattering features near 1.5 eV split in energy as doping is increased and have increasingly mixed A 1 g + A 2 g symmetry. At the same time, the overall A 2 g Raman intensity decreases. We use an annealing/quenching technique on a x∼0.4 sample to explore the transition region further, and find that the Raman intensity increases just after quenching but the peaks do not shift in energy. Room-temperature annealing of the quenched sample shows an initial drop in A 2 g peak intensity over 100 min, a plateau level from 100 to 500 min, and a final slow drop to the original intensity level from 500 to 1100 min. We see the suppressions of A 2 g Raman intensity from doping and annealing as resulting from increases in the carrier concentration. Peak splitting and mixed-symmetry effects seem to be more closely related to variations in the lattice parameters, probably as a result of changes to the in-plane copper d orbitals. © 1996 The American Physical Society.
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