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  Enhanced T-c and multiband superconductivity in the fully-gapped ReBe22 superconductor

Shang, T., Amon, A., Kasinathan, D., Xie, W., Bobnar, M., Chen, Y., et al. (2019). Enhanced T-c and multiband superconductivity in the fully-gapped ReBe22 superconductor. New Journal of Physics, 21: 073034, pp. 1-16. doi:10.1088/1367-2630/ab307b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-77CB-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-77CD-0
Genre: Journal Article

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 Creators:
Shang, T.1, Author
Amon, A.2, Author              
Kasinathan, D.3, Author              
Xie, W.1, Author
Bobnar, M.2, Author              
Chen, Y.1, Author
Wang, A.1, Author
Shi, M.1, Author
Medarde, M.1, Author
Yuan, H. Q.1, Author
Shiroka, T.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: In search of the origin of superconductivity (SC) in diluted rhenium superconductors and their significantly enhanced T-c compared to pure Be (0.026 K), we investigated the intermetallic ReBe22 compound, mostly by means of muon-spin rotation/relaxation (mu SR). At a macroscopic level, its bulk SC (with T-c = 9.4 K) was studied via electrical resistivity, magnetization, and heat-capacity measurements. The superfluid density, as determined from transverse-field mu SR and electronic specific-heat measurements, suggest that ReBe22 is a fully-gapped superconductor with some multigap features. The larger gap value, Delta(l)(0) = 1.78 k(B)T(c), with a weight of almost 90%, is slightly higher than that expected from the BCS theory in the weak-coupling case. The multigap feature, rather unusual for an almost elemental superconductor, is further supported by the field-dependent specific-heat coefficient, the temperature dependence of the upper critical field, as well as by electronic band-structure calculations. The absence of spontaneous magnetic fields below T-c, as determined from zero-field mu SR measurements, indicates a preserved time-reversal symmetry in the superconducting state of ReBe22. In general, we find that a dramatic increase in the density of states at the Fermi level and an increase in the electron-phonon coupling strength, both contribute to the highly enhanced T-c value of ReBe22.

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Language(s): eng - English
 Dates: 2019-07-232019-07-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000476907800002
DOI: 10.1088/1367-2630/ab307b
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Title: New Journal of Physics
  Abbreviation : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 21 Sequence Number: 073034 Start / End Page: 1 - 16 Identifier: ISSN: 1367-2630
CoNE: https://pure.mpg.de/cone/journals/resource/954926913666