Superconductivity, magnetism and crystal chemistry of Ba1-xKxFe2As2

Abstract

BaFe2As2 is the parent compound of the '122' iron arsenide superconductors and crystallizes with the tetragonal ThCr2Si2 type structure, space group I4/mmm. A spin density wave transition at 140 K is accompanied by a symmetry reduction to space group Fmmm and simultaneously by antiferromagnetic ordering. Hole-doping induces superconductivity in Ba1-xKxFe2As2 with a maximum Tc of 38 K at x = 0.4. The upper critical fields approach 75 T with rather small anisotropy of Hc2. At low potassium concentrations (x <= 0.2), superconductivity apparently co-exists with the orthorhombic distorted and magnetically ordered phase. At doping levels x >= 0.3, the structural distortion and antiferromagnetic ordering is completely suppressed and the Tc is maximized. No magnetically ordered domains could be detected in optimally doped Ba1-xKxFe2As2 (x >= 0.3) by 57Fe-Moessbauer spectroscopy in contrast muSR results obtained with single crystals. The magnetic hyperfine interactions investigated by 57Fe Moessbauer spectroscopy are discussed and compared to the ZrCuSiAs-type materials.

23 pages, 12 figures, submitted to Physica C, special issue on Fe-pnictides

References in corpus (31)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Competing Orders and Spin-Density-Wave Instability in La(O${}_{1-x}$F${}_x$)FeAs
• Resonant Spin Excitation in the High Temperature Superconductor Ba0.6K0.4Fe2As2
• Nearly Isotropic superconductivity in (Ba,K)Fe2As2
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Phase transitions in LaFeAsO: structural, magnetic, elastic, and transport properties, heat capacity and Mossbauer spectra
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe${}_2$As${}_2$ single crystals
• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2)
• High-Temperature Superconductivity in Eu0.5K0.5Fe2As2
• Different resistivity response to spin density wave and superconductivity at 20 K in $C{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• The Absence of Superconductivity in Single Phase CaFe2As2 under Hydrostatic Pressure
• Possible re-entrant superconductivity in EuFe2As2 under pressure
• 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${}_2$
• Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• Spin Ordering in LaOFeAs and Its Suppression in Superconductor LaO0.89F0.11FeAs Probed by Mössbauer Spectroscopy
• Muon spin relaxation studies of magnetic order and superfluid density in antiferromagnetic NdOFeAs, BaFe2As2 and superconducting (Ba,K)Fe2As2
• Competition of magnetism and superconductivity in underdoped (Ba1-xKx)Fe2As2
• Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF

Cited by in corpus (22)

• Superconductivity in Iron Compounds
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Unconventional Superconductivity
• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Superconductivity in Ru substituted BaFe2-xRuxAs2
• Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2
• Pressure induced superconductivity in BaFe2As2 single crystal
• Transport properties and asymmetric scattering in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals compared to the electron doped counterparts Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$}
• A perspective on pnictide superconductors
• Control of magnetic, non-magnetic and superconducting states in annealed Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Direct observation of local K variation and its correlation to electronic inhomogeneity in (Ba1-xKx)Fe2As2 Pnictide
• Mechanochemical synthesis of pnictide compounds and superconducting Ba0.6K0.4Fe2As2 bulks with high critical current density
• The electronic specific heat of Ba1-xKxFe2As2 (x=0 to 1.0) from 2K to 380K
• Resistivity and Hall effect of LiFeAs: Evidence for electron-electron scattering
• Plastic pinning replaces collective pinning as the second magnetization peak disappears in the pnictide superconductor Ba-KFe${}_2$As${}_2$
• Correlation-corrected band topology and topological surface states in iron-based superconductors
• Statistics of subgap states in $s_{\pm }$ superconductors
• Superconductivity and Crystal Structure of the Palladium-Iron-Arsenides Ca10(Fe1-xPdxAs)10Pd3As8
• Electric field gradient wave (EFGW) in iron-based superconductor Ba(0.6)K(0.4)Fe2As2 studied by Mössbauer spectroscopy
• Mössbauer spectroscopy study of magnetic fluctuations in superconducting RbGd${}_2$Fe${}_4$As${}_4$O${}_2$
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• A neutron scattering study of the under-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, x=0.09 and 0.17 self-flux grown single crystals and the universality of the tricritical point