Pressure-induced superconductivity up to 13.1 K in the pyrite phase of 
palladium diselenide PdSe2

ElGhazali, Moaz; Naumov, Pavel G.; Mirhosseini, Hossein; Süß, Vicky; Müchler, Lukas; Schnelle, Walter; Felser, Claudia; Medvedev, Sergey A.

doi:10.1103/PhysRevB.96.060509

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Pressure-induced superconductivity up to 13.1 K in the pyrite phase of palladium diselenide PdSe₂

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ElGhazali, Moaz
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Naumov, Pavel G.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mirhosseini, Hossein
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons192597

Süß, Vicky
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126838

Schnelle, Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126748

Medvedev, Sergey A.
Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

ElGhazali, M., Naumov, P. G., Mirhosseini, H., Süß, V., Müchler, L., Schnelle, W., et al. (2017). Pressure-induced superconductivity up to 13.1 K in the pyrite phase of palladium diselenide PdSe₂. Physical Review B, 96(6): 060509, pp. 1-5. doi:10.1103/PhysRevB.96.060509.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-F1D5-A

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.