Ferromagnetic and antiferromagnetic spin fluctuations and superconductivity in the hcp-phase of Fe

Abstract

High purity iron, which transforms into the hcp phase under pressure, has recently been reported to be superconducing in the pressure range 150-300 kBar [shim]. The electronic structure and the electron-phonon coupling (${\lambda }_{ph}$) are calculated for hcp iron at different volumes. A parameter-free theory for calculating the coupling constants ${\lambda }_{sf}$ from ferromagnetic (FM) and antiferromagnetic (AFM) spin fluctuations is developed. The calculated ${\lambda }_{sf}$ are sufficiently large to explain superconductivity especially from FM fluctuations. The results indicate that superconductivity mediated by spin fluctuations is more likely than from electron-phonon interaction.

(4 pages, 1 figure)

References in corpus (3)

• Superconductivity of epsilon-Fe: complete resistive transition
• Superconductivity in compressed iron: Role of spin fluctuations
• Longitudinal spin-fluctuations and superconductivity in ferromagnetic ZrZn${}_2$ from ab initio calculations

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