Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering

Abstract

Recent investigations of the superconducting iron-arsenide families have highlighted the role of pressure, be it chemical or mechanical, in fostering superconductivity. Here we report that CaFe2As2 undergoes a pressure-induced transition to a non-magnetic, volume "collapsed" tetragonal phase, which becomes superconducting at lower temperature. Spin-polarized total-energy calculations on the collapsed structure reveal that the magnetic Fe moment itself collapses, consistent with the absence of magnetic order in neutron diffraction.

accepted for publication in Phys. Rev. B

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• Determination of anisotropic Hc2 up to 60 T in (Ba0.55K0.45)Fe2As2 single crystals
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Possible re-entrant superconductivity in EuFe2As2 under pressure
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• Superconductivity coexisting with phase-separated static magnetic order in (Ba,K)Fe${}_2$As${}_2$, (Sr,Na)Fe${}_2$As${}_2$ and CaFe${}_2$As${}_2$
• Electronic Structure of Fe-Based Superconductors
• Abrupt Emergence of Pressure-Induced Superconductivity of 34 K in SrFe2As2: A Resistivity Study under Pressure
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Superconductivity above 50K in LnFeAsO1-y (Ln= Nd, Sm, Gd, Tb and Dy) Synthesized by High-pressure Technique
• Anisotropic three-dimensional magnetism in CaFe2As2
• Pressure-Induced Effects on the Structure of the FeSe Superconductor
• Superconductivity and the Effects of Pressure and Structure in Single Crystalline SrNi${}_2$P${}_2$
• Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2 - parent compound for an iron arsenic high temperature superconductor
• Pressure-induced superconductivity in Iron pnictide compound SrFe2As2
• Presure-Induced Superconducting State of Antiferromagnetic CaFe${}_2$As${}_2$
• Evolution of bulk superconductivity in SrFe2As2 with Ni substitution
• Topological change of the Fermi surface in ternary iron-pnictides with reduced c/a ratio: A dHvA study of CaFe2P2
• Suppression of antiferromagnetic spin fluctuations in the collapsed tetragonal phase of CaFe2As2
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Successive phase transitions under high pressure in FeTe0.92
• NMR investigation of superconductivity and antiferromagnetism in CaFe${}_2$As${}_2$ under pressure
• Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2
• Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2
• Proximity of LaOFeAs to a magnetic instability
• Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO
• Effect of the tetrahedral distortion on the electronic properties of iron-pnictides
• First-principles investigation of effect of pressure on BaFe${}_2$As${}_2$
• Character of magnetic instabilities in CaFe2As2
• The local atomic structure of superconducting Fe-Se-Te
• Superconductivity in layered iron Selenide induced by cobalt- and sodium-doping