Presure-Induced Superconducting State of Antiferromagnetic CaFe${}_2$As${}_2$

Abstract

The antiferromagnet CaFe${}_2$As${}_2$ does not become superconducting when subject to ideal hydrostatic pressure conditions, where crystallographic and magnetic states also are well defined. By measuring electrical resistivity and magnetic susceptibility under quasi-hydrostatic pressure, however, we find that a substantial volume fraction of the sample is superconducting in a narrow pressure range where collapsed tetragonal and orthorhombic structures coexist. At higher pressures, the collapsed tetragonal structure is stabilized, with the boundary between this structure and the phase of coexisting structures strongly dependent on pressure history. Fluctuations in magnetic degrees of freedom in the phase of coexisting structures appear to be important for superconductivity.

arXiv commentrevised (6 pages, 5 figures) - includes additional experimental results

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Cited by in corpus (35)

• Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
• Stabilization of an ambient pressure, collapsed tetragonal phase in CaFe2As2 and tuning of the orthorhombic / antiferromagnetic transition temperature by over 70 K by control of nano-precipitates
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Control of magnetic, non-magnetic and superconducting states in annealed Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Dramatic Changes in the Electronic Structure Upon Transition to the Collapsed Tetragonal Phase in CaFe2As2
• Phase Diagram of Pressure-Induced Superconductivity in EuFe2As2 Probed by High-Pressure Resistivity up to 3.2 GPa
• Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of CaFe2As2 under uniaxial pressure
• Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe${}_2$As${}_2$
• Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors
• The suppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by 75As NMR-NQR measurements
• Electronic structure of CaFe2As2: Contribution of itinerant Fe 3d-states to the Fermi Level
• Study of the anisotropic magnetic order of the Eu sublattice in single crystals of EuFe_2-xCo_xAs_2 (x = 0, 0.2) by means of magnetization and magnetic torque
• Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2
• Weakening of the diamagnetic shielding in FeSe${}_{1-x}$S${}_x$ at high pressures
• Volovik Effect and Fermi-Liquid Behavior in the s-Wave Superconductor CaPd2As2: 75As NMR-NQR Measurements
• Ab-initio perspective on structural and electronic properties of iron-based superconductors
• Transition to collapsed tetragonal phase in CaFe2As2 single crystals as seen by 57Fe Mossbauer spectroscopy
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Emergent electronic structure of CaFe2As2
• Electronic structure of CaFe2As2
• Large low-temperature magnetoresistance in SrFe2As2 single crystals
• Hidden phase in parent Fe-pnictide superconductors
• Optical properties of iron-based superconductor LiFeAs single crystal
• Combined effects of transition metal (Ni and Rh) substitution and annealing/quenching on physical properties of CaFe${}_2$As${}_2$
• Pressure-induced superconductivity in Eu${}_{0.5}$Ca${}_{0.5}$Fe${}_2$As${}_2$ : FeAs-based superconductivity hidden by antiferromagnetism of Eu sublattice
• High-Pressure Electrical Resistivity Measurements of EuFe2As2 Single Crystals
• Hydrostatic pressure effects on the static magnetism in Eu(Fe${}_{0.925}$Co${}_{0.075}$)${}_2$As${}_2$
• Deconfined quantum critical point lost in pressurized SrCu2(BO3)2
• Signatures of pressure induced superconductivity in insulating Bi2212
• Vibrational anomalies in AFe${}_2$As${}_2$ (A$=$Ca, Sr, and Ba) single crystals
• Pressure-Induced Antiferromagnetic Bulk Superconductor EuFe${}_2$As${}_2$
• Combined effects of Sr substitution and pressure on the ground states in CaFe${}_2$As${}_2$
• Pressure-driven phase transitions in correlated systems
• Discovery of a bi-critical point between antiferromagnetic and superconducting phases in pressurized single crystal Ca0.73La0.27FeAs2