Doping and temperature dependence of Raman scattering from NdFeAsO1−xFx (x=0–0.2) superconductor
L. Zhang, T. Fujita, F. Chen, D. L. Feng, S. Maekawa, M. W. Chen
DOI 10.1103/PhysRevB.79.052507 · Physical Review B
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Abstract
Raman spectra of superconductor NdFeAsO1−xFx (x=0.0,0.1,0.2) compounds have been systematically investigated as functions of temperature and fluorine concentration. It was found that fluorine doping leads to structure disorder of insulator Nd-O layers and detectable downshift as well as increased temperature coefficients of the Fe-As vibrational modes. Additionally, low-temperature Raman measurements reveal that the in-plane phonon modes of the layered compound are unusually more sensitive to temperature change than those along the axis, and this anisotropic temperature dependence of phonon models is further enhanced by fluorine doping.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdFeAsO0.9F0.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33 | Pressure not reported | unknown |
| NdFeAsO0.8F0.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 51 | Pressure not reported | unknown |
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