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  Non-centrosymmetric superconductor Th4Be33Pt16 and heavy-fermion U4Be33Pt16 cage compounds

Koželj, P., Juckel, M., Amon, A., Prots, Y., Ormeci, A., Burkhardt, U., et al. (2021). Non-centrosymmetric superconductor Th4Be33Pt16 and heavy-fermion U4Be33Pt16 cage compounds. Scientific Reports, 11: 22352, pp. 1-9. doi:10.1038/s41598-021-01461-6.

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 Creators:
Koželj, P.1, Author              
Juckel, M.1, Author              
Amon, A.1, Author              
Prots, Yu.2, Author              
Ormeci, A.1, Author              
Burkhardt, U.3, Author              
Brando, M.4, Author              
Leithe-Jasper, A.5, Author              
Grin, Yu.6, Author              
Svanidze, E.1, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
3Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
4Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              
5Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              
6Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: Unconventional superconductivity in non-centrosymmetric superconductors has attracted a considerable amount of attention. While several lanthanide-based materials have been reported previously, the number of actinide-based systems remains small. In this work, we present the discovery of a novel cubic complex non-centrosymmetric superconductor Th4Be33Pt16 (I (4) over bar 3d space group). This intermetallic cage compound displays superconductivity below T-c = 0.90 +/- 0.04 K, as evidenced by specific heat and resistivity data. Th4Be33Pt16 is a type-II superconductor, which has an upper critical field H-c2 = 0.27 T and a moderate Sommerfeld coefficient gamma(n) = 16.3 +/- 0.8 mJ mol(Th)(-1) K-2. A non-zero density of states at the Fermi level is evident from metallic behavior in the normal state, as well as from electronic band structure calculations. The isostructural U4Be33Pt16 compound is a paramagnet with a moderately enhanced electronic mass, as indicated by the electronic specific heat coefficient gamma(n) = 200 mJ mol(U)(-1)K(-2) and Kadowaki-Woods ratio A/gamma(2) = 1.1 x 10(-5) mu Omega cm K-2 mol(U)(2)(mJ)(-2). Both Th4Be33Pt16 and U4Be33Pt16 are crystallographically complex, each hosting 212 atoms per unit cell.

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Language(s): eng - English
 Dates: 2021-11-162021-11-16
 Publication Status: Published in print
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 11 Sequence Number: 22352 Start / End Page: 1 - 9 Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322