Superconducting gap structure of slightly overdoped NaFe0.955Co0.045As pnictides: joint SnS-Andreev spectroscopy and specific heat study

We present a study of the superconducting order parameter in slightly overdoped alkali-metal-based pnictides NaFe 0.955 Co 0.045 As with T c ≈ 21  K using a combination of incoherent multiple Andreev reflection effect (IMARE) spectroscopy of planar SnS-junctions and specific heat measurements. We ob...

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Bibliographic Details
Published in:European physical journal plus 2024-01, Vol.139 (1)
Main Authors: Kuzmichev, Svetoslav, Muratov, Andrei, Gavrilkin, Sergey, Morozov, Igor, Shilov, Andrey, Rakhmanov, Yevgeny, Degtyarenko, Alena, Kuzmicheva, Tatiana
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Atomic
Complex Systems
Condensed Matter Physics
Mathematical and Computational Physics
Molecular
Optical and Plasma Physics
Physics
Physics and Astronomy
Regular Article
Theoretical
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Summary:We present a study of the superconducting order parameter in slightly overdoped alkali-metal-based pnictides NaFe 0.955 Co 0.045 As with T c ≈ 21  K using a combination of incoherent multiple Andreev reflection effect (IMARE) spectroscopy of planar SnS-junctions and specific heat measurements. We observe a multiple-gap superconductivity, directly and locally determine the magnitudes Δ i ( 0 ) , characteristic ratios 2 Δ i ( 0 ) / k B T c , and temperature dependences Δ i ( T ) of the superconducting order parameters. Possible momentum dependence of the revealed gaps is discussed. We show that a usage of the characteristic ratios obtained in the IMARE experiment provides a qualitative fit of the extracted temperature dependence of the electronic specific heat C el ( T ) / T within the two-band approach using only two free parameters.
ISSN:2190-5444
DOI:10.1140/epjp/s13360-024-04879-9