The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure

Abstract

Recent high-pressure studies found that superconductivity can be achieved under very low pressure in the parent iron arsenide compound CaFe2As2, although details of the sharpness and temperature of transitions vary between liquid medium and gas medium measurements. To better understand this issue, we performed high-pressure susceptibility and transport studies on CaFe2As2, using helium as the pressure medium. The signatures of the transitions to the low-temperature orthorhombic and collapsed tetragonal phase remained exceptionally sharp and no signature of bulk superconductivity was found under our hydrostatic conditions. Our results suggest that phase separation and superconductivity in CaFe2As2 are induced by non-hydrostatic conditions associated with the frozen liquid media.

4 pages, 3 figures, Accepted by Physical Review B

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Cited by in corpus (102)

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• High-temperature superconductivity in iron-based materials
• Magnetism in Fe-based superconductors
• Complete pressure dependent phase diagrams for SrFe2As2 and BaFe2As2
• Fundamental studies of superconductors using scanning magnetic imaging
• Structural collapse and superconductivity in rare earth-doped CaFe2As2
• 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${}_2$
• The Unusual Superconducting State at 49 K in Electron-Doped CaFe2As2 at Ambient
• Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Extremely high sensitivity to uniaxial stress in pressure induced superconductivity of BaFe2As2
• Intrinsic Properties of AFe2As2 (A = Ba, Sr) Single Crystal under Highly Hydrostatic Pressure Conditions
• High Pressure Studies on Fe-Pnictide Superconductors
• 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
• Paramagnetic Spin Correlations in CaFe2As2 Single Crystals
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• Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2 - parent compound for an iron arsenic high temperature superconductor
• Enhanced superfluid density on twin boundaries in Ba(Fe1-xCox)2As2
• Superconductivity, magnetism and crystal chemistry of Ba1-xKxFe2As2
• Solidification and loss of hydrostaticity in liquid media used for pressure measurements
• Presure-Induced Superconducting State of Antiferromagnetic CaFe${}_2$As${}_2$
• Pressure-induced changes in the magnetic and valence state of EuFe2As2
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• Higher superconducting transition temperature by breaking the universal pressure relation
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• Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of CaFe2As2 under uniaxial pressure
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• Interplay of Superconductivity and Fermi-Liquid Transport in Rh-Doped CaFe2As2 with Lattice-Collapse Transition
• Probing local pressure environment in anvil cells with nitrogen vacancy (NV-) centers in diamond
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• Resistivity and magnetoresistance of FeSe single crystals under Helium-gas pressure
• Fermi-Surface Reconstruction and Complex Phase Equilibria in CaFe${}_2$As${}_2$
• Preserved entropy and fragile magnetism
• The suppression of magnetism and the development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 at high pressure
• The suppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by 75As NMR-NQR measurements
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