Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3

Abstract

Nematic orders emerge nearly universally in iron-based superconductors, but elucidating their origins is challenging because of intimate couplings between orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3, which superconducts under pressure, exhibits antiferromagnetic order below TN ~ 117K and a weak resistivity anomaly at T* ~ 180K, whose nature remains elusive. Here we report angle-resolved magnetoresistance (MR) and elastoresistance (ER) measurements in BaFe2S3, which reveal distinct changes at T*. We find that MR anisotropy and ER nematic response are both suppressed near T*, implying that an orbital order promoting isotropic electronic states is stabilized at T*. Such an isotropic state below T* competes with the antiferromagnetic order, which is evidenced by the nonmonotonic temperature dependence of nematic fluctuations. In contrast to the cooperative nematic orders in spin and orbital channels in iron pnictides, the present competing orders can provide a new platform to identify the separate roles of orbital and magnetic fluctuations.

arXiv comment7 pages 5 figures, to be published in Phys. Rev. Res

References in corpus (18)

• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Divergent nematic susceptibility in an iron arsenide superconductor
• Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
• Selective Mottness as a key to iron superconductors
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Nematic quantum critical point without magnetism in FeSe1-xSx superconductors
• Pressure-induced Superconductivity in the Iron-based Ladder Material BaFe2S3
• Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2
• Iron Displacements and Magnetoelastic Coupling in the Spin-Ladder Compound BaFe2Se3
• Electronic structure of optimally doped pnictide Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$: a comprehensive ARPES investigation
• Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe2Se3
• The magnetic precursor of the pressure-induced superconductivity in Fe-ladder compound
• Magnetic properties and pairing tendencies of the iron-based superconducting ladder BaFe${}_2$S${}_3$: combined ab initio and density matrix renormalization group study
• Orbital order and fluctuations in the two-leg ladder materials BaFe${}_2{X}_3$ ($X$ = S and Se) and CsFe${}_2$Se${}_3$
• Ab initio downfolding study of the iron-based ladder superconductor BaFe${}_2$S${}_3$
• Coexistence of localized and itinerant electrons in BaFe2X3 (X = S and Se) revealed by photoemission spectroscopy
• Gradual Enhancement of Stripe-Type Antiferromagnetism in Spin Ladder Material BaFe${}_2$S${}_3$ Under Pressure

Cited by in corpus (2)

• Pressure-induced superconductivity in iron-based spin-ladder compound BaFe2+δ(S1-Sex)3
• Terminable Transitions in a Topological Fermionic Ladder