Nematic spin correlations pervading the phase diagram of FeSe${}_{1-x}$S${}_x$

Abstract

We use resonant inelastic X-ray scattering (RIXS) at the Fe-L${}_3$ edge to study the spin excitations of uniaxial-strained and unstrained FeSe${}_{1-x}$S${}_x$ ($0\le x\le 0.21$) samples. The measurements on unstrained samples reveal dispersive spin excitations in all doping levels, which show only minor doping dependence in energy dispersion, lifetime, and intensity, indicating that high-energy spin excitations are only marginally affected by sulfur doping. RIXS measurements on uniaxial-strained samples reveal that the high-energy spin-excitation anisotropy observed previously in FeSe is also present in the doping range $0<x\le 0.21$ of FeSe${}_{1-x}$S${}_x$. The spin-excitation anisotropy persists to a high temperature up to $T>200$ K in $x=0.18$ and reaches a maximum around the nematic quantum critical doping ($x_c\approx 0.17$). Since the spin-excitation anisotropy directly reflects the existence of nematic spin correlations, our results indicate that high-energy nematic spin correlations pervade the regime of nematicity in the phase diagram and are enhanced by the nematic quantum criticality. These results emphasize the essential role of spin fluctuations in driving electronic nematicity and open the door for uniaxial strain tuning of spin excitations in quantum materials hosting strong magnetoelastic coupling and electronic nematicity.

arXiv comment6 pages, 4 figures, supplemental materials uploaded

References in corpus (40)

• Resonant Inelastic X-ray Scattering Studies of Elementary Excitations
• Nematic order in iron superconductors - who is in the driver's seat?
• Theory of Intertwined Orders in High Temperature Superconductors
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Divergent nematic susceptibility in an iron arsenide superconductor
• Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
• The Structural Phase Transition in FeSe (Fe1+dSe)
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Ironing out the details of unconventional superconductivity
• Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Nematicity and quantum paramagnetism in FeSe
• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• Magnetic ground state of FeSe
• The key ingredients of the electronic structure of FeSe
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Nematic susceptibility of hole- and electron-doped BaFe2As2 iron-based superconductors from shear modulus measurements
• Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe
• Exotic Superconducting States in FeSe-based Materials
• Persistent high-energy spin excitations in iron pnictide superconductors
• Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr${}_2$RuO${}_4$
• Highly Anisotropic Superconducting Gap in Nematically Ordered and Tetragonal Phases of FeSe${}_{1-x}$S${}_x$
• Anisotropic spin fluctuations in detwinned FeSe
• Using RIXS to uncover elementary charge and spin excitations in correlated materials
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Evolution of spin excitations from bulk to monolayer FeSe
• Impact of Uniaxial Pressure on Structural and Magnetic Phase Transitions in Electron-Doped Iron Pnictides
• Local orthorhombicity in the magnetic $C_4$ phase of the hole-doped iron-arsenide superconductor Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Spin-excitation anisotropy in the nematic state of detwinned FeSe
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Spin Waves in Detwinned BaFe${}_2$As${}_2$
• Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe${}_{1-x}$Ni${}_x$As
• Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis
• Iron-based superconductors: teenage, complex, challenging
• Spontaneous orbital polarization in the nematic phase of FeSe
• Diverse fluctuations and anisotropic Gr{\" u}neisen parameter behavior in iron-based superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ and their correlation with superconductivity
• Paramagnon dispersion in $\beta$-FeSe observed by Fe $L$-edge resonant inelastic x-ray scattering
• Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Spin fluctuation anisotropy as a probe of orbital-selective hole-electron quasiparticle excitations in detwinned Ba(Fe1-xCox)2As2