Nematic Fluctuations in an Orbital Selective Superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$

Abstract

We present a systematic study of the nematic fluctuations in the iron chalcogenide superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ ($0\le x\le 0.53$) using the elastoresistivity technique. Near $x=0$, in proximity to the double-stripe magnetic order of Fe${}_{1+y}$Te, a diverging $B_{1g}$ nematic susceptibility is observed. Upon increasing $x$, despite the absence of magnetic order, the $B_{2g}$ nematic susceptibility increases and becomes dominant, closely following the strength of the $(\pi ,\pi )$ spin fluctuations. Over a wide range of compositions ($0.17\le x\le 0.53$), while the $B_{2g}$ nematic susceptibility follows a Curie temperature dependence (with zero Weiss temperature) at low temperatures, it shows deviations from Curie-Weiss behavior for temperatures higher than $50K$. This is the opposite of what is observed in typical iron pnictides, where Curie-Weiss deviations are seen at low temperatures. We attribute this unusual temperature dependence to a loss of coherence of the $d_{xy}$ orbital, which is supported by our theoretical calculations. Our results highlight the importance of orbital differentiation on the nematic properties of iron-based materials.

References in corpus (50)

• Nematic order in iron superconductors - who is in the driver's seat?
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Theory of Electron Nematic Order in LaOFeAs
• First-order magnetic and structural phase transitions in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Ising and Spin orders in Iron-based Superconductors
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Orbital-driven nematicity in FeSe
• Discovery of Orbital-Selective Cooper Pairing in FeSe
• Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
• Selective Mottness as a key to iron superconductors
• Effect of magnetic frustration on nematicity and superconductivity in Fe 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
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Nematicity and quantum paramagnetism in FeSe
• Nematicity, magnetism and superconductivity in FeSe
• Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
• Evolution of spin excitations into the superconducting state in FeTe1-xSex
• Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe
• Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe
• Maximizing Tc by tuning nematicity and magnetism in FeSe1-xSx superconductors
• Orbital Selectivity in Hund's metals: The Iron Chalcogenides
• Sign-reversing orbital polarization in the nematic phase of FeSe due to the $C_2$ symmetry-breaking in the self-energy
• Unconventional temperature enhanced magnetism in iron telluride
• Review of annealing effects and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ superconductors
• Experimental Observation of Incoherent-Coherent Crossover and Orbital Dependent Band Renormalization in Iron Chalcogenide Superconductors
• Magnetic, superconducting, and topological surface states on Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Nematicity at the Hund's metal crossover in iron superconductors
• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Orbital selectivity enhanced by nematic order in FeSe
• Pure nematic quantum critical point accompanied by a superconducting dome
• Ferro-orbital ordering transition in iron telluride Fe${}_{1+y}$Te
• Spin-Driven Nematic Instability of the Multi-Orbital Hubbard Model: Application to Iron-Based Superconductors
• Nematicity, magnetism and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory
• Strong and nonmonotonic temperature dependence of Hall coefficient in superconducting K${}_x$Fe${}_{2-y}$Se${}_2$ single crystals
• Spin-orbital interplay and topology in the nematic phase of iron pnictides
• Spin liquid polymorphism in a correlated electron system on the threshold of superconductivity
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Orbital order in FeSe - the case for vertex renormalization
• Evolution of the nematic susceptibility in LaFe${}_{1-x}$Co${}_x$AsO
• Double stage nematic bond-ordering above double stripe magnetism: application to BaTi${}_2$Sb${}_2$O
• Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ revealed by magnetotransport measurements
• Evolution from $B_{2g}$ nematics to $B_{1g}$ nematics in heavily hole-doped iron-based superconductors
• Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe${}_{1-x}$Se${}_x$
• Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe${}_{1-x}$Se${}_x$ with $x\le 0.2$
• Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds

Cited by in corpus (5)

• Pure nematic quantum critical point accompanied by a superconducting dome
• Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
• Non-local $d_{xy}$ nematicity and the missing electron pocket in FeSe
• Transfer learning from Hermitian to non-Hermitian quantum many-body physics
• Non-Fermi liquid transport and strong mass enhancement near the nematic quantum critical point in FeSe${}_x$Te${}_{1-x}$ thin films