Pressure-induced superconductivity up to 13.1 K in the pyrite phase of palladium diselenide PdSe2
Moaz A. ElGhazali, Pavel G. Naumov, Hossein Mirhosseini, Vicky Süß, Lukas Müchler, Walter Schnelle, Claudia Felser, Sergey A. Medvedev
DOI 10.1103/PhysRevB.96.060509 · Physical Review B
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Abstract
The evolution of electrical transport properties, the electronic band structure, and lattice dynamics of PdSe2 is studied under high pressure. The emergence of superconductivity is reported in the high-pressure pyrite-type phase of PdSe2. In this transition-metal dichalcogenide, the critical temperature of superconductivity rapidly increases with pressure up to 13.1 K. Ab initio electronic band structure calculations indicate the presence of Dirac and nodal-line fermions in the vicinity of the Fermi energy protected by the pyrite structure symmetry, which can lead to interesting superconducting states. Raman spectroscopy shows a direct correlation between critical temperature and bonding strength of Se-Se dumbbells in PdSe2, underlining the crucial role of bonding for tuning the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PdSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.4 | 7.2 GPa | onset |
| PdSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.1 | 23 GPa | unknown |
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