Pressure-induced metallization, transition to the pyrite-type structure, and superconductivity in palladium disulfide Pd S2
Elghazali MA, Naumov PG, Mu Q, Suess , Baskakov AO, Felser C, Medvedev SA (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 100
Article Number: 014507
Journal Issue: 1
DOI: 10.1103/PhysRevB.100.014507
Abstract
The pressure effect on crystal structures, lattice vibrations, and electrical transport properties of PdS2 and NiSe2 were studied under high pressures of up to ∼50 GPa using Raman spectroscopy and electrical resistivity measurements. PdS2 undergoes semiconductor-to-metal transition at a pressure of ∼7 GPa without a structural phase transition. Structural transition to the pyrite-type phase occurs at a pressure of ∼16 GPa. Superconductivity emerges in the pyrite-type phase of PdS2 with a well-defined dome-shaped dependence of critical temperature of superconductivity on pressure, with a maximum value of 8.0 K at 37.4 GPa. Although this behavior is similar to that in isostructural PdSe2, correlation with anomalous anion bond softening at critical temperature is not observed in PdS2 in contrast to PdSe2. Conversely, the anion bond instability is observed by the softening of the Se22- internal vibrational Raman mode in pyrite NiSe2 under pressure. Despite the persisting structural instability due to destabilization of Se22- dimers, NiSe2 remains a normal nonsuperconducting metal.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
How to cite
APA:
Elghazali, M.A., Naumov, P.G., Mu, Q., Suess, ., Baskakov, A.O., Felser, C., & Medvedev, S.A. (2019). Pressure-induced metallization, transition to the pyrite-type structure, and superconductivity in palladium disulfide Pd S2. Physical Review B, 100(1). https://doi.org/10.1103/PhysRevB.100.014507
MLA:
Elghazali, M. A., et al. "Pressure-induced metallization, transition to the pyrite-type structure, and superconductivity in palladium disulfide Pd S2." Physical Review B 100.1 (2019).
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