Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2

Abstract

Detailed knowledge of the phase diagram and the nature of the competing magnetic and superconducting phases is imperative for an understanding of the physics of iron-based superconductivity. Here, we show using thermodynamic probes that the phase diagram of the first discovered, and highest Tc, 122-type material, Ba1-xKxFe2As2 is in fact much richer than previously reported. Inside the usual stripe-type magnetic order with C2-symmetry, we find a small pocket of a tetragonal, C4-symmetric phase, which surprisingly reverts back to the C2-phase at or slightly below the superconducting transition. This re-entrance to a low-temperature orthorhombic state induced by superconductivity is discussed in terms of competition of the two magnetic phases with superconductivity and is illustrated by the measured changes in the electronic entropy of the system. Using our thermodynamic data, we make predictions about how the phase diagram of these competing orders will change under pressure.

14 pages, 4 figures, and Supplemental Material

References in corpus (16)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• High-temperature superconductivity in iron-based materials
• Phase Diagram of Ba1-xKxFe2As2
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Competing orders in FeAs layers
• Magnetoelastic Coupling in the Phase Diagram of Ba1-xKxFe2As2
• Spin reorientation in Na-doped BaFe${}_2$As${}_2$ studied by neutron diffraction
• Competing magnetic double-Q phases and superconductivity-induced re-entrance of C2 magnetic stripe order in iron pnictides
• New Phase Induced by Pressure in the Iron-Arsenide Superconductor K-Ba122
• Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
• Symmetry of re-entrant tetragonal phase in Ba1-xNaxFe2As2: Magnetic versus orbital ordering mechanism
• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
• Giant domain wall response of highly twinned ferroelastic materials
• Anomalous density of states in multiband superconductors near Lifshitz transition
• Direct imaging of the structural domains in iron pnictides AFe2As2 (A = Ca, Sr, Ba)
• Interplay between tetragonal magnetic order, stripe magnetism, and superconductivity in iron-based materials

Cited by in corpus (109)

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• Charge Nematicity and Electronic Raman Scattering in Iron-based Superconductors
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• Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy
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• Microscopic nature of correlations in multi-orbital AFe2As2 (A=K, Rb, Cs): Hund's coupling versus Coulomb repulsion
• Detailed magnetic and structural analysis mapping a robust magnetic C4 dome in Sr1-xNaxFe2As2
• Local orthorhombicity in the magnetic $C_4$ phase of the hole-doped iron-arsenide superconductor Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained $BaF{e}_{2}A{s}_2$
• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Muon-spin-rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
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• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
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• Superconductivity and electronic fluctuations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by Raman scattering
• Expansion of the tetragonal magnetic phase with pressure in the iron-arsenide superconductor Ba{1-x}KxFe2As2
• Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations
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• Experimental evidence for the importance of Hund's exchange interaction for the incoherence of the charge carriers in iron-based superconductors
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• Manipulating surface magnetic order in iron telluride
• Symmetry breaking and ascending in the magnetic kagome metal FeGe
• Short-range nematic fluctuations in Sr1-xNaxFe2As2 superconductors
• Topological Superconductivity from Unconventional Band Degeneracy with Conventional Pairing
• Spin-Orbit Coupling and Magnetic Anisotropy in Iron-Based Superconductors
• NMR Study of the New Magnetic Superconductor CaK(Fe$0.951Ni0.049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity
• Doping evolution of the superconducting gap structure in the underdoped iron arsenide Ba1-xKxFe2As2 revealed by thermal conductivity
• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
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• Realization of epitaxial thin films of the superconductor K-doped BaFe${}_{\text{2}}$As${}_{\text{2}}$
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• Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2
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• Neutron Spin Resonance Near a Lifshitz Transition in Overdoped Ba${}_{0.4}$K${}_{0.6}$Fe${}_2$As${}_2$
• Incommensurate magnetic states induced by ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}\mathrm{N}{\mathrm{a}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Magnetic properties of the itinerant A-type antiferromagnet CaCo2P2 studied by 59Co and 31P NMR
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