Superconductivity and magnetic and transport properties of single-crystalline CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$

Abstract

Members of the CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$ series have been synthesized by high-temperature solution growth in single crystalline form and characterized by X-ray diffraction, elemental analysis, magnetic and transport measurements. The effects of Cr substitution on the superconducting and magnetic ground states of CaKFe${}_4$As${}_4$ ($T_c$ = 35 K) have been studied. These measurements show that the superconducting transition temperature decreases monotonically and is finally suppressed below 1.8 K as $x$ is increased from 0 to 0.038. The magnetic transition temperature increases in a roughly linear manner as Cr substitution increases. A temperature-composition (\textit{T}-\textit{x}) phase diagram is constructed, revealing a half-dome of superconductivity with the magnetic transition temperature, $T^{\ast }$, appearing near 22~K for $x$ $\sim$ 0.017 and rising slowly up to 60~K for $x$ $\sim$ 0.077. The $T$-$x$ phase diagrams for CaK(Fe${}_{1-x}$$T$${}_x$)${}_4$As${}_4$ for $T$ = Cr and Mn are essentially the same despite the nominally different band filling; this is in marked contrast to $T$ = Co and Ni series for which the $T$-$x$ diagrams scale by a factor of two, consistent with the different changes in band filling Co and Ni would produce when replacing Fe. Superconductivity of CaK(Fe${}_{1-x}$Cr${}_x$)${}_4$As${}_4$ is also studied as a function of magnetic field. A clear change in $H_{c2}^{\prime }$($T$)/$T_c$, where $H_{c2}^{\prime }$($T$) is d$H_{c2}$($T$)/d$T$, at $x$ $\sim$ 0.012 is observed and probably is related to change of the Fermi surface due to magnetic order. Coherence length and the London penetration depths are also calculated based on $H_{c1}$ and $H_{c2}$ data. Coherence lengths as the function of $x$ also shows changes near $x$ = 0.012, again consistent with Fermi surfaces changes associated with the magnetic ordering seen for higher $x$-values.

arXiv commentThis work uses the same synthesis and measurements methods to systematicly analysis Cr1144 as our previous work arXiv:2204.10925 (existence of the text overlap) but gives the clear proof of the bi-modal response to electron and hole doping in Fe-based superconductors

References in corpus (35)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Use of frit-disc crucibles for routine and exploratory solution growth of single crystalline samples
• Effective Demagnetization Factors of Diamagnetic Samples of Various Shapes
• Nematicity, magnetism and superconductivity in FeSe
• Temperature-doping phase diagrams for Ba(Fe1-xTMx)2As2(TM=Ni, Cu, Cu / Co) single crystals
• Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
• Anisotropic thermodynamic and transport properties of single crystalline CaKFe${}_4$As${}_4$
• Superconductivity in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with Separate Double Fe${}_2$As${}_2$ Layers
• New Materials Physics
• Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
• Resistivity Anisotropy of $AE$Fe${}_2$As${}_2$ ($AE$ =Ca, Sr, Ba): direct versus Montgomery technique measurements
• Optimization of the Crystal Growth of the Superconductor CaKFe${}_4$As${}_4$ from Solution in the FeAs-CaFe${}_2$As${}_2$-KFe${}_2$As${}_2$ System
• Nodeless multiband superconductivity in stoichiometric single crystalline CaKFe${}_4$As${}_4$
• Non-monotonic pressure evolution of the upper critical field in superconducting FeSe
• Homes scaling and BCS
• Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure
• Anisotropic superconductivity and magnetism in single-crystal RbEuFe${}_4$As${}_4$
• Synthesis, crystal structure and superconductivity in Rb$L{n}_2$Fe${}_4$As${}_4$O${}_2$ ($Ln$ = Sm, Tb, Dy and Ho)
• Measurements of the lower critical field of superconductors using NV centers in diamond optical magnetometry
• Upper critical field of KFe2As2 under pressure: A test for the change in the superconducting gap structure
• Small anisotropy of the lower critical field and $s_{\pm }$-wave two-gap feature in single crystal LiFeAs
• Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor, CaKFe${}_4$As${}_4$
• Hydrostatic and uniaxial pressure tuning of iron-based superconductors: Insights into superconductivity, magnetism, nematicity and collapsed tetragonal transitions
• X-Ray diffraction on large single crystals using a powder diffractometer
• London Penetration Depth and Pair Breaking
• Angular-dependent upper critical field of overdoped Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Coexistence of superconductivity and magnetism in CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ as probed by ${}^{57}$Fe Mössbauer spectroscopy
• Anisotropy induced vortex lattice rearrangement in CaKFe${}_4$As${}_4$
• Pressure-temperature phase diagrams of CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors
• On temperature-dependent anisotropies of upper critical field and London penetration depth
• Superconductivity and phase diagrams of CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$ single crystals

Cited by in corpus (5)

• A-15 type superconducting hydride $L{a}_4{H}_{23}$: Nanograined structure with low strain, strong electron-phonon interaction, and moderate level of nonadiabaticity
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$
• Hole doping and electronic correlations in Cr-substituted BaFe${}_2$As${}_2$
• Antiferromagnetic order and its interplay with superconductivity in CaK(Fe${}_{1-x}$Mn${}_x$)${}_4$As${}_4$
• Signature of Unconventional Superconductivity in the High Temperature Normal State Resistivity