Expansion of the tetragonal magnetic phase with pressure in the iron-arsenide superconductor Ba{1-x}KxFe2As2

Abstract

In the temperature-concentration phase diagram of most iron-based superconductors, antiferromagnetic order is gradually suppressed to zero at a critical point, and a dome of superconductivity forms around that point. The nature of the magnetic phase and its fluctuations is of fundamental importance for elucidating the pairing mechanism. In Ba{1-x}KxFe2As2 and Ba{1-x}NaxFe2As2, it has recently become clear that the usual stripe-like magnetic phase, of orthorhombic symmetry, gives way to a second magnetic phase, of tetragonal symmetry, near the critical point, between x = 0.24 and x = 0.28. Here we report measurements of the electrical resistivity of Ba{1-x}KxFe2As2 under applied hydrostatic pressures up to 2.75 GPa, for x = 0.22, 0.24 and 0.28. We track the onset of the tetragonal magnetic phase using the sharp anomaly it produces in the resistivity. In the temperature-concentration phase diagram of Ba{1-x}KxFe2As2, we find that pressure greatly expands the tetragonal magnetic phase, while the stripe-like phase shrinks. This raises the interesting possibility that the fluctuations of the former phase might be involved in the pairing mechanism responsible for the superconductivity.

References in corpus (25)

• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Competition and coexistence of antiferromagnetism and superconductivity in underdoped Ba(Fe0.953Co0.047)2As2
• Phase Diagram of Ba1-xKxFe2As2
• Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
• Superconductivity-induced reentrance of orthorhombic distortion in Ba1-xKxFe2As2
• Magnetic degeneracy and hidden metallicity of the spin density wave state in ferropnictides
• Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4
• Competing orders in FeAs layers
• Proximity of Iron Pnictide Superconductors to a Quantum Tricritical Point
• Spin reorientation in Na-doped BaFe${}_2$As${}_2$ studied by neutron diffraction
• Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy
• High pressure study of BaFe2As2 - role of hydrostaticity and uniaxial stress
• Competing magnetic double-Q phases and superconductivity-induced re-entrance of C2 magnetic stripe order in iron pnictides
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• A comprehensive scenario of the single crystal growth and doping dependence of resistivity and anisotropic upper critical fields in (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ ($0.22\le x\le 1$)
• New Phase Induced by Pressure in the Iron-Arsenide Superconductor K-Ba122
• Tetragonal magnetic phase in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ from x-ray and neutron diffraction
• Microscopically derived Ginzburg-Landau theory for magnetic order in the iron pnictides
• Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
• Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1-xKxFe2As2 (0.2 < x < 1.0) series
• Infrared study of the spin reorientation transition and its reversal in the superconducting state in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Properties of a diagonal 2-orbital ladder model of the Fe-pnictide superconductors
• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
• Heat capacity jump at T_c and pressure derivatives of superconducting transition temperature in the Ba(1-x)NaxFe2As2 (0.1 <= x <= 0.9) series
• Restoration of tetragonal $C_4$ symmetry coexistent with filamentary superconductivity in the pressure induced intermediate phase in the iron-based superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$

Cited by in corpus (17)

• Intertwined vestigial order in quantum materials: nematicity and beyond
• Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations
• Distinct pressure evolution of coupled nematic and magnetic order in FeSe
• NMR Study of the New Magnetic Superconductor CaK(Fe$0.951Ni0.049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity
• Order parameter fluctuation and ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}{\mathrm{K}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• Pressure-temperature phase diagrams of CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ superconductors
• Scanning tunneling spectroscopy as a probe of multi-Q magnetic states of itinerant magnets
• Preferred magnetic excitations in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Competition between orthorhombic and re-entrant tetragonal phases in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ probed by the response to controlled disorder
• Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr${}_{0.67}$Na${}_{0.33}$Fe${}_2$As${}_2$
• Magnetic properties of the itinerant A-type antiferromagnet CaCo2P2 studied by 59Co and 31P NMR
• Incommensurate magnetic states induced by ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}\mathrm{N}{\mathrm{a}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Strain tuning and anisotropic spin correlations in iron-based systems
• Quasiclassical theory of $C_4$-symmetric magnetic order in disordered multiband metals