Extremely strong-coupling superconductivity and anomalous lattice properties in the β-pyrochlore oxide KOs2O6
Z. Hiroi, S. Yonezawa, Y. Nagao, J. Yamaura
DOI 10.1103/PhysRevB.76.014523 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Superconducting and normal-state properties of the β-pyrochlore oxide KOs2O6 are studied by means of thermodynamic and transport measurements. It is shown that the superconductivity is of conventional s-wave type and lies in the extremely strong-coupling regime. Specific heat and resistivity measurements reveal that there are characteristic low-energy phonons that give rise to unusual scattering of carriers due to strong electron-phonon interactions. The entity of the low-energy phonons is ascribed to the heavy rattling of the K ion confined in an oversized cage made of OsO6 octahedra. It is suggested that this electron-rattler coupling mediates the Cooper pairing, resulting in the extremely strong-coupling superconductivity.
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 unresolved | onset |
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure unresolved | onset |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | 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 |
| 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 |
Similar papers
Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
similarity 1.00Z. Hiroi et al. · 2007 · arXiv:0704.1528
Source status unknown — claims are unverified
Crystal growth, structure, and superconducting properties of the β-pyrochlore KOs2O6
similarity 0.98G. Schuck et al.
Source status unknown — claims are unverified
Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
similarity 0.98Y. Kasahara et al.
Source status unknown — claims are unverified
Interplay of Superconductivity and Rattling Phenomena in β-Pyrochlore KOs2O6 Studied by Photoemission Spectroscopy
similarity 0.98T. Shimojima et al.
Source status unknown — claims are unverified
Electronic structure properties and BCS superconductivity in β-pyrochlore oxides: KOs2O6
similarity 0.97R. Saniz et al.
Source status unknown — claims are unverified
Phonons and crystal structures of the β-pyrochlore superconductors KOs2O6 and RbOs2O6 from micro-Raman spectroscopy
similarity 0.97J. Schoenes et al.
Source status unknown — claims are unverified