Superconductivity in the (Ba1−xSrx)8Si46 clathrates (x⩽0.75): Experimental and ab initio investigation
P. Toulemonde, Ch. Adessi, X. Blase, A. San Miguel, J. L. Tholence
DOI 10.1103/PhysRevB.71.094504 · 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
Si clathrates (Ba1−xSrx)8Si46 with x⩽0.75 have been successfully synthesized and their superconductivity studied both experimentally and by ab initio calculations. The linear decrease of the cubic lattice parameter with the Sr content shows the continuous shrinkage of the constituting (Ba∕Sr)@Si20 and (Ba∕Sr)@Si24 cages, while the critical superconducting transition temperature Tc decreases from 8Kto4.1K at 75% of substitution. The experimentally extrapolated value for the Tc of the hypothetical Sr8Si46 is in good agreement with the calculated one of 3K. The lower contribution of the Sr d-electrons to the density of states at the Fermi energy explains the observations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba8Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | onset |
| (Ba0.75Sr0.25)8Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | onset |
| (Ba0.50Sr0.50)8Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure not reported | onset |
| (Ba0.25Sr0.75)8Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.1 | Pressure not reported | onset |
| Sr8Si46 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
Similar papers
Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
similarity 0.95E. Reny et al.
Source status unknown — claims are unverified
Superconductivity of metal doped-boron-nitrogen clathrates under ambient pressure
similarity 0.95Chen Chen et al.
Source status unknown — claims are unverified
Enhanced high-pressure superconductivity and local structure of the Ba8Si46 clathrate
similarity 0.94F. Morales et al.
Source status unknown — claims are unverified
Superconductivity in gallium-substituted Ba8Si46 clathrates
similarity 0.93Yang Li et al.
Source status unknown — claims are unverified
Electronic structure and superconducting gap of silicon clathrate Ba8Si46 studied with ultrahigh-resolution photoemission spectroscopy
similarity 0.93T. Yokoya et al.
Source status unknown — claims are unverified
Superconductivity in Doped sp3 Semiconductors: The Case of the Clathrates
similarity 0.93D. Connétable et al.
Source status unknown — claims are unverified