Pressure effects on the electronic properties and superconductivity in the $β$-pyrochlore oxides: $A$Os$_2$O$_6$ ($A$ = Na, K, Rb, Cs)
| dc.creator | Saniz, R. | |
| dc.creator | Freeman, A. J. | |
| dc.date | 2005-06-01 | |
| dc.date.accessioned | 2026-07-07T03:05:27Z | |
| dc.date.available | 2026-07-07T03:05:27Z | |
| dc.description | We present a first-principles study of the electronic structure and superconducting parameters of the compounds $A$Os$_2$O$_6$ ($A$ = Na, K, Rb, and Cs) and at ambient and applied hydrostatic pressure. We find that the sensitivity of the density of states at the Fermi energy, $E_{\rm F}$, and related electronic properties to the size of the alkali metal atom as well as to applied pressure is driven by a van Hove singularity with energy very close to $E_{\rm F}$. Further, a computation of the superconducting parameters of these materials allows us to show that the observed change of $T_c$, both upon substitution of the alkali metal and under applied hydrostatic pressure, can be well understood within a phonon-mediated pairing scenario. In this regard, we find that the correction to the effective electron mass due to spin fluctuations plays a significant role. | |
| dc.description | 8 pages, 4 figures; to appear in Phys. Rev. B | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0506028 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0506028 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/26452 | |
| dc.subject | Superconductivity | |
| dc.title | Pressure effects on the electronic properties and superconductivity in the $β$-pyrochlore oxides: $A$Os$_2$O$_6$ ($A$ = Na, K, Rb, Cs) | |
| dc.type | text |