Calculation of penetration depth in cecu2si2
Jul 28, Recent observations of non-nodal gap structure in the heavy-fermion superconductor CeCu2Si2 were then very surprising, given that dependent magnetic penetration depth λ(T) in CeCu2Si2.
We find that the fully-gapped Specific calculations for CeCu2Si2 have shown that spin-fluctuations can lead to .
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Mar 8, magnetic penetration depth measurements in CeCu2Si2, demonstrating the absence of gap nodes at CeCu2Si2 is a prototypical heavy-fermion superconductor near a magnetic instability [1, 11] with transition temperature Tc ≃ K  (Fig.2A).
.. calculation of electron scattering cross sections, mainly.
Description:PDF Significance Identifying the gap structure of superconductors is vital for understanding the underlying pairing mechanism of the Cooper pairs. The first heavy fermion superconductor to be discovered, CeCu2Si2, was thought to be a d -wave superconductor with gap nodes, until recent specific heat measurements provided evidence that the gap is fully open across the Fermi surface. We propose a resolution to this puzzle from measurements of the London penetration depth, which give further evidence for fully gapped superconductivity. We analyze the data using a d -wave band-mixing pairing model, which leads to a fully open superconducting gap. Our model accounts well for the penetration depth and specific heat data, while reconciling the nodeless and sign-changing nature of the gap function. Abstract The nature of the pairing symmetry of the first heavy fermion superconductor CeCu2Si2 has recently become the subject of controversy.