Large $D-2$ Theory of Superconducting Fluctuations in a Magnetic Field and its Application to Iron-Pnictides

Abstract

A Ginzburg-Landau approach to fluctuations of a layered superconductor in a magnetic field is used to show that the interlayer coupling can be incorporated within an interacting self-consistent theory of a single layer, in the limit of a large number of neighboring layers. The theory exhibits two phase transitions -- a vortex liquid-to-solid transition is followed by a Bose-Einstein condensation into the Abrikosov lattice -- illustrating the essential role of interlayer coupling. Using this theory, explicit expressions for magnetization, specific heat, and fluctuation conductivity are derived. We compare our results with recent experimental data on the iron-pnictide superconductors.

5 pages, 3 figures. Published version. Streamlined presentation; typos corrected in Eqs. (14, 20) and elsewhere; improved Figs. (1, 3); additional references

References in corpus (11)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• A minimal two-band model for the superconducting Fe-pnictides
• Multiband magnetism and superconductivity in Fe-based compounds
• Crystal structure and phase transitions across the metal-superconductor boundary in the SmFeAsO1-xFx (0 < x < 0.20) family
• Experimental Consequences of the S-wave $\cos (k_x)\cdot \cos (k_y)$ Superconductivity in the Iron-Pnictides
• Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
• Anisotropy of superconducting single crystal SmFeAsO_(0.8)F_(0.2) studied by torque magnetometry
• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Green functions for nearest- and next-nearest-neighbor hopping on the Bethe lattice

Cited by in corpus (5)

• Measurements of the superconducting fluctuations in optimally-doped BaFe${}_{2-x}$Ni${}_x$As${}_2$ under high magnetic fields: Probing the 3D anisotropic Ginzburg-Landau approach
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Vortex-lattice melting and paramagnetic depairing in the nematic superconductor FeSe
• Measurements of the fluctuation-induced in-plane magnetoconductivity at high reduced temperatures and magnetic fields in the iron arsenide BaFe(2-x)NixAs2
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy