Spin fluctuations, electron-phonon coupling and superconductivity in near-magnetic elementary metals; Fe,Co,Ni and Pd

Abstract

An investigation of possibilities for superconductivity mediated by spin fluctuations in some elementary metals is motivated by the recent discovery of superconductivity in the hcp high-pressure phase of iron. The electronic structure, the electron-phonon coupling (${\lambda }_{ph}$) and the coupling due to spin-fluctuations (${\lambda }_{sf}$) are calculated for different phases and different volumes for four elementary metals. The results show that such possibilities are best for systems near, but on the non-magnetic side of, a magnetic instability. Fcc Ni, which show stable magnetism over a wide pressure range, is not interesting in this respect. Ferro- and antiferro-magnetic fluctuations in hcp Fe contribute to a relatively strong coupling in the pressure range where superconductivity is observed. The absence of fluctuations at large q-vectors makes fcc Pd only moderately interesting despite its large exchange enhancement for q=0. Fcc Co at high pressure ($\sim$ 0.5 Mbar) behaves as an improved version of Pd, where the fluctuations extend to larger q. The estimations of T${}_C$, which reproduce the experimental situation in Fe quite well, suggest a measurable T${}_C$ for the high-pressure phase of fcc Co, while the estimate is lower for the ambient-pressure phase of fcc Pd.

9 pages, 4 figures, 2 tables

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• Longitudinal spin-fluctuations and superconductivity in ferromagnetic ZrZn${}_2$ from ab initio calculations
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Cited by in corpus (14)

• Effects of spin-phonon interaction on the properties of in high-T${}_C$ superconductors
• Critical temperature and giant isotope effect in presence of paramagnons
• \emph{Ab initio} calculations of structural stability, thermodynamic and elastic properties of Ni, Pd, Rh, and Ir at high pressures
• Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4
• Electronic structure and magnetism for FeSi${}_{(1-x)}$Ge${}_x$ from supercell calculations
• Anti-ferromagnetism, spin-phonon interaction and the local-density approximation in high-T${}_C$ superconductors
• Spin-phonon coupling, q-dependence of spin excitations and high-T${}_C$ superconductivity from band models
• Multiple electronic components and Lifshitz transitions by oxygen wires formation in layered cuprates and nickelates
• A model of the T-dependent pseudogap and its competition with superconductivity in copp er oxides
• Magnetic fluctuations and superconducting pairing in $\epsilon$-iron
• Electronic structure and properties of superconducting materials with simple Fermi surfaces
• Theoretical aspects of simple and nested Fermi surfaces for superconductivity in doped semiconductors and high-$T_C$ cuprates
• Pressure-induced collapse of ferromagnetism in Nickel
• Electronic structure, doping, order and disorder in cuprate superconductors