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Superconductivity with High Upper Critical Field in the Cubic Centrosymmetric η-Carbide NbRhC. | LitMetric

AI Article Synopsis

  • * The Pauli paramagnetic limit for weak-coupling BCS superconductors is approximately μ ≈ 1.86[T/K], with rare exceptions in specific high-temperature superconductors.
  • * The study presents NbRhC as a new material demonstrating superconductivity at 9.75 K with an upper critical field of μ(0) = 28.5 T, surpassing the expected limit of 18.1 T, which could lead to significant advancements in understanding critical fields in superconductors.

Article Abstract

The upper critical field is a fundamental measure of the strength of superconductivity in a material. It is also a cornerstone for the realization of superconducting magnet applications. The critical field arises because of the Cooper pair breaking at a limiting field, which is due to the Pauli paramagnetism of the electrons. The maximal possible magnetic field strength for this effect is commonly known as the Pauli paramagnetic limit given as μ ≈ 1.86[T/K]· for a weak-coupling Bardeen-Schrieffer-Cooper (BCS) superconductor. The violation of this limit is only rarely observed. Exceptions include some low-temperature heavy Fermion and some strongly anisotropic superconductors. Here, we report on the superconductivity at 9.75 K in the centrosymmetric, cubic η-carbide-type compound NbRhC, with a normalized specific heat jump of Δ/γ = 1.64. We find that this material has a remarkably high upper critical field of μ (0) = 28.5 T, which is exceeding by far its weak-coupling BCS Pauli paramagnetic limit of μ = 18.1 T. Determination of the origin and consequences of this effect will represent a significant new direction in the study of critical fields in superconductors.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9888667PMC
http://dx.doi.org/10.1021/acsmaterialsau.1c00011DOI Listing

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