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  Superconductivity of MoBe22 and WBe22 at ambient- and under applied-pressure conditions

Shiroka, T., Shang, T., Juckel, M., Krnel, M., König, M., Burkhardt, U., et al. (2022). Superconductivity of MoBe22 and WBe22 at ambient- and under applied-pressure conditions. Physical Review Materials, 6(6): 064804, pp. 1-10. doi:10.1103/PhysRevMaterials.6.064804.

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Shiroka, T.1, Author
Shang, T.1, Author
Juckel, M.2, Author           
Krnel, M.2, Author           
König, M.3, Author           
Burkhardt, U.4, Author           
Koželj, P.2, Author           
Gupta, R.1, Author
Prots, Yu.5, Author           
Svanidze, E.2, Author           
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863470              
4Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
5Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              

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Free keywords: Magnetic susceptibility, Neodymium compounds, Specific heat, Ambients, Applied pressure, Critical temperatures, Heat capacity measurements, Microscopic levels, Multiphases, Muon spin spectroscopy, Pressure conditions, Superconducting properties, Superconducting state, Shear waves
 Abstract: MoBe22 and WBe22 compounds belong to the binary XBe22 (X=4d or 5d metal) family of superconductors, whose critical temperature depends strongly on X. Despite the multiphase nature of these samples, it is possible to investigate the superconducting properties of MoBe22 and WBe22 at the macro- A nd microscopic level. A concurrent analysis by means of magnetization and heat-capacity measurements, as well as muon-spin spectroscopy (μSR) was implemented. At ambient pressure, both compounds enter the superconducting state below 2.6±0.1 K (MoBe22) and 4.1±0.10 K (WBe22) and show modest upper critical fields [(μ0Hc2(0)=48±1 mT and μ0Hc2(0)=58±1 mT, respectively]. In WBe22, the temperature-dependent superfluid density suggests a fully gapped superconducting state, well-described by an s-wave model with a single energy gap. Heat-capacity data confirm that such a model applies to both compounds. Finally, ac magnetic susceptibility measurements under applied pressures up to 2.1 GPa reveal a linear suppression of the superconducting temperature, typical of conventional superconducting compounds. © 2022 authors. Published by the American Physical Society.

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Language(s): eng - English
 Dates: 2022-06-272022-06-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevMaterials.6.064804
 Degree: -

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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mater.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 6 (6) Sequence Number: 064804 Start / End Page: 1 - 10 Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953