Pressure induced superconductivity in CaFe${}_2$As${}_2$

Abstract

CaFe${}_2$As${}_2$ has been found to be exceptionally sensitive to the application of hydrostatic pressure and superconductivity has been found to exist in a narrow pressure region that appears to be at the interface between two different phase transitions. The pressure - temperature ($P-T$) phase diagram of CaFe${}_2$As${}_2$ reveals that this stoichiometric, highly ordered, compound can be easily tuned to reveal all the salient features associated with FeAs-based superconductivity without introducing any disorder. Whereas at ambient pressure CaFe${}_2$As${}_2$ does not superconduct for $T>1.8$ K and manifests a first order structural phase transition near $T\approx 170$ K, the application of $\sim 5$ kbar hydrostatic pressure fully suppresses the resistive signature of the structural phase transition and instead superconductivity is detected for $T<12$ K. For $P\ge 5.5$ kbar a different transition is detected, one associated with a clear reduction in resistivity and for $P>8.6$ kbar superconductivity is no longer detected. This higher pressure transition temperature increases rapidly with increasing pressure, exceeding 300 K by $P\sim 17$ kbar. The low temperature, superconducting dome is centered around 5 kbar, extending down to 2.3 kbar and up to 8.6 kbar. This superconducting phase appears to exist when the low pressure transition is suppressed sufficiently, but before the high pressure transition has reduced the resistivity, and possibly the associated fluctuations, too dramatically.

References in corpus (1)

• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals

Cited by in corpus (298)

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• Superconducting density of states and vortex lattice of LaRu${}_2$P${}_2$ observed by Scanning Tunneling Spectroscopy
• Magnetic phase diagram of Sr${}_{1-x}$Ca${}_x$Co${}_2$P${}_2$
• Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x = 0 and 0.45) and CaFe2As2
• Effect of Co doping and hydrostatic pressure on SrFe2As2
• Evidences for local non-centrosymmetricity and strong phonon anomaly in EuCu2As2: A Raman spectroscopy and lattice dynamics study
• Pressure Induced Superconductivity and Structural Transitions in Ba(Fe0.9Ru0.1)2As2
• Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2 solid solutions
• Localized and itinerant dichotomy of electrons in Ba(Fe,Co)2As2
• Interplay of stripe and double-Q magnetism with superconductivity in ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_x{\mathrm{Fe}}_2{\mathrm{As}}_2$ under the influence of magnetic fields
• Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi
• Reinforcement of interfacial superconductivity in a Bi2Te3/Fe1+yTe heterostructure under hydrostatic pressure
• Analysis of exchange interactions in dimers of Mn3 single-molecule magnets, and their sensitivity to external pressure
• Stripe Antiferromagnetic Ground-State Configuration of FeSe Revealed by Density Functional Theory
• Rectification from band gap oscillation
• Unusual role of ligand states in the electronic properties of a parent Fe-based superconductor, CaFe2As2
• Novel 122-type Ir-based superconductors BaIr2Mi2 (Mi = P and As): A density functional study