Pseudogap Behavior of the Nuclear Spin-lattice Relaxation Rate in FeSe Probed by ${}^{77}$Se-NMR

Abstract

We conducted ${}^{77}$Se-nuclear magnetic resonance studies of the iron-based superconductor FeSe in magnetic fields of 0.6 to 19 T to investigate the superconducting and normal-state properties. The nuclear spin-lattice relaxation rate divided by the temperature $(T_{1}T{)}^{-1}$ increases below the structural transition temperature $T_{\mathrm{s}}$ but starts to be suppressed below $T^{\ast }$, well above the superconducting transition temperature $T_{\mathrm{c}}(H)$, resulting in a broad maximum of $(T_{1}T{)}^{-1}$ at $T_{\mathrm{p}}(H)$. This is similar to the pseudogap behavior in optimally doped cuprate superconductors. Because $T^{\ast }$ and $T_{\mathrm{p}}(H)$ decrease in the same manner as $T_{\mathrm{c}}(H)$ with increasing $H$, the pseudogap behavior in FeSe is ascribed to superconducting fluctuations, which presumably originate from the theoretically predicted preformed pair above $T_{\mathrm{c}}(H)$.

arXiv comment10 pages, 4 figures

References in corpus (22)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Nematic order in iron superconductors - who is in the driver's seat?
• BCS-BEC Crossover: From High Temperature Superconductors to Ultracold Superfluids
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Orbital-driven nematicity in FeSe
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Emergence of the nematic electronic state in FeSe
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• BCS-BEC Crossover and the Unitary Fermi Gas
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS-BEC crossover
• Coexistence of isotropic s-wave and extended s-wave order parameters in FeSe as revealed by the low-temperature specific heat
• Superconductivity in an electron band just above the Fermi level: possible route to BCS-BEC superconductivity
• 3D-XY critical fluctuations of the thermal expansivity in detwinned YBa2Cu3O7-d single crystals near optimal doping
• Superconducting Fluctuation Effects on the Spin-Lattice Relaxation Rate in YBa_2Cu_3O_{6.95}
• Effects of Strong Magnetic Fields on Pairing Fluctuations in High Temperature Superconductors
• BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
• Superconductivity-enhanced Nematicity and '$s+d$' Gap Symmetry in Fe(Se${}_{1-x}$S${}_x$)
• Quasiparticle Excitations in the Superconducting State of FeSe Probed by Thermal Hall Conductivity in the Vicinity of the BCS-BEC Crossover
• Magnetic-field-induced finite-size effect in the high-temperature superconductor YBa2Cu3O7-a comparison to rotating superfluid 4 He

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• Preformed Cooper pairs in layered FeSe-based superconductors
• Correlation between Superconductivity and Magnetic Fluctuations in Fe(Se1-xSx) Revealed by 77Se NMR
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Spectroscopic Evidence of Superconductivity Pairing at 83 K in Single-Layer FeSe/SrTiO3 Films
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution $\mu$SR measurements
• Superconducting fluctuation in FeSe investigated by precise torque magnetometry
• Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe
• Inhomogeneous Knight shift in vortex cores of superconducting FeSe
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Interrelationships between nematicity, antiferromagnetic spin fluctuations and superconductivity: Role of hotspots in FeSe${}_{1-x}$S${}_x$ revealed by high pressure ${}^{77}$Se NMR study
• Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
• Superconductivity of highly spin-polarized electrons in FeSe probed by ${}^{77}$Se NMR
• Dimensionality-induced BCS-BEC crossover in layered superconductors
• Stabilization of vortex-liquid state by strong pairing interaction
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Quasiparticle interaction originating from Bogoliubov Fermi Surfaces under pressure in 18%-S substituted FeSe studied via NMR