Effect of pressure on superconductivity in NaAlSi
Leslie Schoop, Lukas Müchler, Jennifer Schmitt, Vadim Ksenofontov, Sergey Medvedev, Jürgen Nuss, Frederick Casper, Martin Jansen, R. J. Cava, Claudia Felser
DOI 10.1103/PhysRevB.86.174522 · Physical Review B
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Abstract
The ternary superconductor NaAlSi, isostructural with LiFeAs, the “111” iron pnictide superconductor, is investigated under pressure. The structure remains stable up to 15 GPa. Resistivity and susceptibility measurements show an increase of Tc up to 2 GPa, followed by a decrease until superconductivity disappears at 4.8 GPa. Band structure calculations show that pressure should have a negligible effect on the electronic structure and the Fermi surface and thus the disappearance of superconductivity under pressure must have a different origin. We compare the electronic structure of NaAlSi under pressure with that of nonsuperconducting isostructural NaAlGe.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.4 | Pressure unresolved | onset |
| NaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.6 | 2 GPa | onset |
| NaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.3 | 0.5 GPa | unknown |
| NaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | 3.5 GPa | unknown |
| NaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| NaAlGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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