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On the s±-Wave Superconductivity in the Iron-Based Superconductors: A Perspective Based on a Detailed Study of Ba0.6K0.4Fe2As2via the Generalized-Bardeen-Cooper-Schrieffer Equations Incorporating Fermi Energy

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Open Journal of Composite Materials 2017年第3期7卷 130-145页

作者： G.P.Malik School of Environmental Sciences Jawaharlal Nehru UniversityNew DelhiIndia B-208 Sushant Lok 1 Gurgaon 122009HaryanaIndia

Guided by the belief that Fermi energy EF (equivalently, chemical potential μ) plays a pivotal?role in determining the properties of superconductors (SCs), we have recently derived μ-incorporated Generalized-Bardeen-Cooper-Schrieffer?equations (GbcsEs) for the gaps (Δs) and critical temperatures (Tcs) of both elemental and composite SCs. The μ-dependent interaction parameters consistent with the values of Δs and Tcs of any of these SCs were shown to lead to expressions for the effective mass of electrons (m*) and their number density (ns), critical velocity (v0), and the critical current density j0 at T = 0 in terms of the following five parameters: Debye temperature, EF, a dimensionless construct y, the specific heat constant, and the gram-atomic volume. We could then fix the value of μ in any SC by appealing to the experimental value of its j0 and calculate the other parameters. This approach was followed for a variety of SCs—elemental, MgB2 and cuprates and, with a more accurate equation to determine y, for Nitrogen Nitride (NbN). Employing the framework given for NbN, we present here a detailed study of Ba0.6K0.4Fe2As2 (BaAs). Some of the main attributes of this SC are: it is characterized by?-wave superconductivity and multiple gaps between 0?-?12 meV;its Tc ~?37 K, but the maximum Tc of SCs in its class can exceed 50 K;EF/kTc = 4.4 (k = Boltzmann constant), and its Tc plotted against a tuning variable has a dome-like structure. After drawing attention to the fact that the?-wave is an inbuilt feature of GbcsEs, we give a quantitative account of its several other features, which include the values of m*, ns, vo, and?coherence length. Finally, we also deal with the issue of the stage BaAs occupies in the bcs-Bose-Einstein Condensation crossover.

关键词： Iron-Based Superconductors Multiple Gaps Tcs and Other Properties of Ba0.6K0.4Fe2As2 GbcsEs Fermi energy bcs-bec Crossover

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