Phonons and crystal structures of the β-pyrochlore superconductors KOs2O6 and RbOs2O6 from micro-Raman spectroscopy
J. Schoenes, A.-M. Racu, K. Doll, Z. Bukowski, J. Karpinski
DOI 10.1103/PhysRevB.77.134515 · Physical Review B
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Abstract
The phonons and the crystal structures of the β-pyrochlore superconductors KOs2O6 and RbOs2O6 are studied on single crystals by using micro-Raman spectroscopy. The symmetry of the modes is determined by polarization dependent measurements for various scattering geometries. It is concluded that the crystal structures are centrosymmetric (Fd3¯m). The vibrational frequencies have been computed from first principles and are in good agreement with the experimental data. The Raman-active rattling mode of the alkali ion is identified at 75 and 60 cm−1 for the K and Rb compounds, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | unknown |
| CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.3 | Pressure not reported | unknown |
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