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  Pressure-induced metallization, transition to the pyrite-type structure, and superconductivity in palladium disulfide PdS2

ElGhazali, M. A., Naumov, P. G., Mu, Q., Süß, V., Baskakov, A. O., Felser, C., et al. (2019). Pressure-induced metallization, transition to the pyrite-type structure, and superconductivity in palladium disulfide PdS2. Physical Review B, 100(1): 014507, pp. 1-7. doi:10.1103/PhysRevB.100.014507.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-75B1-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-75C8-7
Genre: Journal Article

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 Creators:
ElGhazali, M. A.1, Author              
Naumov, P. G.1, Author              
Mu, Q.1, Author              
Süß, V.1, Author              
Baskakov, A. O.2, Author
Felser, C.3, Author              
Medvedev, S. A.4, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
4Sergiy Medvediev, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863438              

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 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 similar to 50 GPa using Raman spectroscopy and electrical resistivity measurements. PdS2 undergoes semiconductor-to-metal transition at a pressure of similar to 7 GPa without a structural phase transition. Structural transition to the pyrite-type phase occurs at a pressure of similar to 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 Se-2(2-) internal vibrational Raman mode in pyrite NiSe2 under pressure. Despite the persisting structural instability due to destabilization of Se-2(2-) dimers, NiSe2 remains a normal nonsuperconducting metal.

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Language(s): eng - English
 Dates: 2019-07-112019-07-11
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 100 (1) Sequence Number: 014507 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008