Close proximity of FeSe to a magnetic quantum critical point as revealed by high-resolution $\mu$SR measurements

Abstract

A nematic transition preceding a long-range spin density wave antiferromagnetic phase is a common feature of many Fe based superconductors. However, in the FeSe system with a nematic transition at $T_{\mathrm{s}}\approx$ 90 K no evidence for long-range static magnetism down to very low temperature was found. The lack of magnetism is a challenge for the theoretical description of FeSe. Here, we investigated high-quality single crystals of FeSe using high-field (up to 9.5 Tesla) muon spin rotation ($\mu$SR) measurements. The $\mu$SR Knight shift and the bulk susceptibility linearly scale at high temperatures but deviate from this behavior around $T^{\ast }\sim 10$ K, where the Knight shift exhibits a kink. This behavior hints to an essential change of the electronic and/or magnetic properties crossing the region near $T^{\ast }$. In the temperature range $T_{\mathrm{s}}\gtrsim T\gtrsim T^{\ast }$ the muon spin depolarization rate follows a critical behavior $\Lambda \propto T^{-0.4}$. The observed non-Fermi liquid behavior with a cutoff at $T^{\ast }$ indicates that FeSe is in the vicinity to a antiferromagnetic quantum critical point. Our analysis is suggestive for $T^{\ast }$ triggered by the Lifshitz transition.

arXiv comment15 pages, 16 figures

References in corpus (33)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Nematic order in iron superconductors - who is in the driver's seat?
• musrfit: A free platform-independent framework for muSR data analysis
• Orbital-driven nematicity in FeSe
• Quantum critical point lying beneath the superconducting dome in iron-pnictides
• Emergence of the nematic electronic state in FeSe
• Effect of magnetic frustration on nematicity and superconductivity in Fe chalcogenides
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• 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
• Magnetic ground state of FeSe
• Pressure Induced Static Magnetic Order in Superconducting FeSe_1-x
• Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
• Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields
• Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS-BEC crossover
• Origin of the Resistivity Anisotropy in the Nematic Phase of FeSe
• Nematicity and magnetism in FeSe and other families of Fe-based superconductors
• Pressure Induced Stripe-order Antiferromagnetism and First-order Phase Transition in FeSe
• Effect of nematic ordering on electronic structure of FeSe
• Electric Transport of a Single Crystal Iron Chalcogenide FeSe Superconductor: Evidence of Symmetry Breakdown Nematicity and Additional Ultrafast Dirac cone-Like Carriers
• Electron carriers with possible Dirac-cone-like dispersion in FeSe${}_{1-x}$S${}_x$ ($x$ = 0 and 0.14) single crystals triggered by structural transition
• Superconductivity with broken time reversal symmetry in ion irradiated Ba${}_{0.27}$K${}_{0.73}$Fe${}_2$As${}_2$ single crystals
• Spin excitations in a model of FeSe with orbital ordering
• Emergence of an incipient ordering mode in FeSe
• Anomalous temperature evolution of the electronic structure of FeSe
• Competing instabilities, orbital ordering and splitting of band degeneracies from a parquet renormalization group analysis of a 4-pocket model for iron-based superconductors: application to FeSe
• NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure
• Pseudogap Behavior of the Nuclear Spin-lattice Relaxation Rate in FeSe Probed by ${}^{77}$Se-NMR
• Pressure induced magnetic order in FeSe
• Robustness of superconductivity to competing magnetic phases in tetragonal FeS
• Structural-transition-induced quasi two-dimensional Fermi surface in FeSe
• Magnetic glassy phase in FeSeTe single crystals

Cited by in corpus (17)

• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• The Nematic Energy Scale and the Missing Electron Pocket in FeSe
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Coexistence of orbital and quantum critical magnetoresistance in FeSe${}_{1-x}$S${}_x$
• Anomalous high-magnetic field electronic state of the nematic superconductors FeSe${}_{1-x}$S${}_x$
• Muon spin rotation study of type-I superconductivity: elemental $\beta -$Sn
• Theoretical study of impurity-induced magnetism in FeSe
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Extended Magnetic Dome Induced by Low Pressures in Superconducting FeSe${}_{1\text{-}\mathrm{x}}$S${}_{\mathrm{x}}$
• Nematic state of the FeSe superconductor
• Superconductivity of highly spin-polarized electrons in FeSe probed by ${}^{77}$Se NMR
• Nematic properties of FeSe${}_{1-x}$Te${}_x$ crystals with a low Te content
• Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation
• Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15
• Effective Ionic Valence and Local Magnetic Moment in Kagome Superconductors
• Microscopic Description of Unconventional Nodal Superconductivity in FeSe