Raman analysis of asymmetrical chains in YBa2Cu3O7−δ films

Hong, Seongsik; Kim, Kyungmoon; Cheong, Hyeonsik; Park, Gwangseo

doi:10.1016/j.physc.2007.02.001

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…In the ZZ spectra, one observes additional lines of A g character at 224 and 601 cm −1 . These positions are close to those of defect modes related to displacements of Cu1 and O1 at the end of broken chains, 13,15,21 which could preexist or be created by photoactivation in our ortho-II sample.…”

Section: Samples and Experimentssupporting

confidence: 73%

“…The spectral shapes and Raman line frequencies from the 1-yr-aged surfaces are consistent with those from earlier reports on the XX / YY and ZZ spectra of twinned YBCO6.5 12 and YBCO x ͑x Ϸ 6.5͒ samples. [20][21][22] The corresponding spectra from the freshly cleaved and aged surfaces, however, exhibit definite differences in the positions and appearance of some of the peaks. Figure 2 shows the Raman spectra from the freshly cleaved surfaces at 90 K in all available exact scattering configurations.…”

Section: Samples and Experimentsmentioning

confidence: 99%

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Raman study of twin-free ortho-IIYBa2Cu3O6.5single crystals

et al. 2008

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The polarized Raman scattering spectra from freshly cleaved ab, ac, and bc surfaces of high quality twin-free YBa 2 Cu 3 O 6.5 ͑ortho-II͒ single crystals ͑T c = 57.5 K and ⌬T = 0.6 K͒ were studied between 80 and 300 K. All 11 A g Raman modes expected for the ortho-II structure as well as some modes of B 2g and B 3g symmetries were identified in close comparison to predictions of lattice dynamical calculations. The electronic scattering from the ab planes is strongly anisotropic and decreases between 200 and 100 K within the temperature range of a previously reported pseudogap opening. The coupling of phonons to Raman active electronic excitations manifested by asymmetric ͑Fano͒ profiles of several modes also decreases within the same range. Among the findings that distinguish the Raman scattering of the ortho-II phase from that of the ortho-I phase is the unusual relationship ͑␣ xx Ϸ −␣ yy ͒ between the elements of the Raman tensor of the apex oxygen A g mode.

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Section: Samples and Experimentssupporting

confidence: 73%

Section: Samples and Experimentsmentioning

confidence: 99%

Raman study of twin-free ortho-IIYBa2Cu3O6.5single crystals

et al. 2008

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“…The remaining three modes are dominated by the vibrations of O(2), O(3), and the apical O(4) oxygen atoms at 340 cm À1 , 440 cm À1 , and 500 cm À1 , respectively. The first two modes involve the out-of-phase vibrations O(2, 3)-A g and the in-phase vibrations O(2, 3)-A g , respectively [25]. Fig.…”

Section: Resultsmentioning

confidence: 96%

Raman Study of Tb-doped YBCO and Ce-doped GdBCO

Mozaffari

Akhavan

2008

Physica C: Superconductivity and its Applications

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“…In Figure 3(a), a broad peak around 530 cm −1 was detected at P O2 of 125 Pa. There was no enough oxygen for the chemistry reaction during the SmBCO film deposition process, the peak of the apical O(4) mode (the peak around 500 cm −1 ) moved to the right [26]. The O(2)+/O(3)peak at around 317 cm −1 was higher than that of 500 cm −1 (Figure 3(b)), indicating the orientation of SmBCO film was mainly c-axis at P O2 of 200 Pa, and the peaks located at 220 cm −1 were extremely weak, which manifested that the SmBCO film deposited at the P O2 of 200 Pa had excellent crystal structure.…”

Section: Resultsmentioning

confidence: 99%