Superconductivity in Uncollapsed Tetragonal LaFe2As2

Abstract

We report synthesis, crystal structure and superconductivity in ThCr2Si2-type LaFe2As2 (La122). La122 was synthesized at 960°C for 1.5 h under a pressure of 3.4 GPa. An as-synthesized La122 (non-superconductor) had a collapsed tetragonal structure with a short c-axis length of 11.0144(4) Å as observed in CaFe2As2 under pressure. The collapsed tetragonal transformed into an uncollapsed tetragonal by annealing the as-synthesized La122 at 500°C. The c-axis length remarkably extended to 11.7317(4) Å and superconductivity emerged at 12.1 K in the uncollapsed tetragonal La122. A cylindrical hole-like Fermi-surface around the Γ point that plays an important role for an s+-wave paring in iron-based superconductors was missing in the uncollapsed tetragonal La122 due to heavily electron-doping. Superconductivity in La122 may be closely related to that induced in CaFe2As2 under pressure.

8 pages, 7 figures, 1 table

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Cited by in corpus (10)

• Novel Fe-based superconductor LaFe2As2 in comparison with traditional pnictides
• Insulator-metal-superconductor transition in medium-entropy van der Waals compound MEPSe3 (ME=Fe, Mn, Cd, and In) under high pressures
• Controlling T${}_c$ through band structure and correlation engineering in collapsed and uncollapsed phases of iron arsenides
• Interplay between band structure and Hund's correlation to increase T${}_c$ in FeSe
• Hidden robust presence of a hole Fermi surface in a heavily electron doped iron based superconductor LaFe${}_2$As${}_2$
• Experimental investigation of electronic interactions in collapsed and uncollapsed LaFe2As2 phases
• Unconventional Multi-gap Superconductivity and Antiferromagnetic Spin Fluctuations in New Iron-arsenide LaFe2As2 in Heavily Electron-doped Regime
• The uncollapsed LaFe2As2 phase: compensated, highly doped, electron-phonon coupled, iron-based superconductor
• Electronic Correlations and Absence of Superconductivity in the Collapsed Phase of LaFe${}_2$As${}_2$
• Rationalizing doping and electronic correlations in LaFe${}_2$As${}_2$