Lattice dynamics of Ti-based pnictide superconductors Ba1−xNaxTi2Sb2O
A. P. Litvinchuk, Phoung Doan, Zhongjia Tang, Arnold M. Guloy
DOI 10.1103/PhysRevB.87.064505 · Physical Review B
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Abstract
The lattice dynamics of layered Ba1−xNaxTi2Sb2O pnictides (0≤x≤0.3) is studied experimentally by means of Raman scattering and theoretically within the density functional theory. Both symmetry allowed Raman-active modes are observed in the spectra and assigned to the lattice eigenmodes: z-axis motion of Sb ions (A1g-symmetry mode) and in-xy-plane displacement of Sb (Eg-symmetry vibration). Calculated and experimental frequencies of these modes are found to be in good agreement. The Eg mode exhibits a nonmonotonous dependence of its frequency upon doping, which is found to correlate with the variation of Sb-Ti distances and strength of the interaction between Ti2Sb2O slabs.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | unknown |
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