Tuning the interplay between nematicity and spin fluctuations in Na${}_{1-x}$Li${}_x$FeAs superconductors

Abstract

Strong interplay of spin and charge/orbital degrees of freedom is the fundamental characteristic of the iron-based superconductors (FeSCs), which leads to the emergence of a nematic state as a rule in the vicinity of the antiferromagnetic state. Despite intense debate for many years, however, whether nematicity is driven by spin or orbital fluctuations remains unsettled. Here, by use of transport, magnetization, and ${}^{75}$As nuclear magnetic resonance (NMR) measurements, we show a striking transformation of the relationship between nematicity and spin fluctuations (SFs) in Na${}_{1-x}$Li${}_x$FeAs; For $x\le 0.02$, the nematic transition promotes SFs. In contrast, for $x\ge 0.03$, the system undergoes a non-magnetic phase transition at a temperature $T_0$ into a distinct nematic state that suppresses SFs. Such a drastic change of the spin fluctuation spectrum associated with nematicity by small doping is highly unusual, and provides insights into the origin and nature of nematicity in FeSCs.

arXiv comment24 pages, 5 figures, 6 supplementary figures; Published in Nature Communications

References in corpus (44)

• Nematic order in iron superconductors - who is in the driver's seat?
• The superconductivity at 18 K in LiFeAs system
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Why Does Undoped FeSe Become A High Tc Superconductor Under Pressure?
• Orbital-driven nematicity in FeSe
• Preemptive nematic order, pseudogap, and orbital order in the iron pnictides
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2
• Cu-63 NQR Measurement of Stripe Order Parameter in La(2-x)Sr(x)CuO(4)
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Nematicity, magnetism and superconductivity in FeSe
• Nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2
• Role of the orbital degree of freedom in iron-based superconductors
• Low-energy microscopic models for iron-based superconductors: a review
• Control via electron count of the competition between magnetism and superconductivity in cobalt and nickel doped NaFeAs
• The origin of nematic order in FeSe
• Electronic nematic susceptibility of iron-based superconductors
• Multiple phase transitions in single-crystalline Na${}_{1-\delta }$FeAs
• Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors
• Nematic fluctuations and the magneto-structural phase transition in $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{o}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$
• Phase Diagram and Calorimetric Properties of NaFe${}_{1-x}$Co${}_x$As
• ${}^{75}$As NQR and NMR studies of superconductivity and electron correlations in iron arsenide Li${}_x$FeAs
• Coexistence of cluster spin glass and superconductivity in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ for $0.060\le x\le 0.071$
• 23Na and 75As NMR Study of Antiferromagnetism and Spin Fluctuations on NaFeAs Single Crystals
• The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs
• Theory of Valley-Density Wave and Hidden Order in Iron-Pnictides
• Interplay between magnetism, superconductivity, and orbital order in a 5-pocket model for iron-based superconductors - a parquet renormalization group study
• Phase diagram and physical properties of NaFe${}_{1-x}$Cu${}_x$As single crystals
• Normal state spin dynamics in the iron-pnictide superconductors BaFe2(As1-xPx)2 and Ba(Fe1-xCox)2As2 probed with NMR measurements
• Crossover from commensurate to incommensurate antiferromagnetism in stoichiometric NaFeAs revealed by single-crystal 23Na,75As-NMR experiments
• Orbital Order and Spin Nematicity in the Tetragonal Phase of Electron-doped Iron-Pnictides NaFe${}_{1-x}$Co${}_x$As
• NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors
• Nematicity and in-plane anisotropy of superconductivity in $\beta$-FeSe detected by ${}^{77}$Se nuclear magnetic resonance
• Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})
• Cu substitution effects on the local magnetic properties of Ba(Fe_[1-x]Cu_[x])2As2: a site-selective 75-As and 63-Cu NMR study
• Simultaneous optimization of spin fluctuations and superconductivity under pressure in an iron-based superconductor
• Crystal growth and the electronic phase diagram of the 4$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As in comparison with 3$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As
• Revisiting ${}^{63}$Cu NMR evidence for charge order in superconducting La${}_{1.885}$Sr${}_{0.115}$CuO${}_4$
• Phase Separation, Competition, and Volume Fraction Control in NaFe${}_{1-x}$Co${}_x$As
• ${}^{139}$La and ${}^{63}$Cu NMR investigation of charge order in La${}_2$CuO${}_{4+y}$ ($T_c=42$K)

Cited by in corpus (4)

• Quantitative characterization of short-range orthorhombic fluctuations in FeSe through pair distribution function analysis
• Widespread orthorhombic fluctuations in the (Sr,Na)Fe${}_2$As${}_2$ family of superconductors
• Iron-based superconductors: tales from the nuclei
• Dynamics of orbital degrees of freedom probed via isotope ${}^{121,123}$ Sb nuclear quadrupole moments in Sb-substituted iron-pnictide superconductors