NMR Study in the Iron-Selenide Rb0.74Fe1.6Se2: Determination of the Superconducting Phase as Iron Vacancy-Free Rb0.3Fe2Se2

Abstract

77Se and 87Rb nuclear magnetic resonance (NMR) experiments on Rb0.74Fe1.6Se2 reveal clearly distinct spectra originating from a majority antiferromagnetic (AF) and a minority metallic-superconducting (SC) phase. The very narrow NMR line of the SC phase evidences the absence of Fe vacancies and any trace of AF order. The Rb content of the SC phase is deduced from intensity measurements identifying Rb0.3(1)Fe2Se2 as the actual composition of the SC fraction. The resulting estimate of 0:15 electrons/Fe brings this class of superconductors 245 family closer to the other Fe-based superconductor families.

arXiv commentTo be published in Phys.Rev.Lett. (editor's suggestion). 5 pages, 4 figures

References in corpus (27)

• High-temperature superconductivity in iron-based materials
• Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
• A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor
• Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor
• Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
• Atomic coexistence of superconductivity and incommensurate magnetic order in the Ba(Fe1-xCox)2As2 pnictide
• Electronic identification of the actual parental phase of KxFe2-ySe2 superconductor and its intrinsic mesoscopic phase separation
• The Electron Pairing of K${}_x$Fe${}_{2-y}$Se${}_2$
• Intrinsic phase separation in superconducting K0.8Fe1.6Se2 (Tc= 31.8 K) single crystals
• Electronic and magnetic phase diagram in K${}_x$Fe${}_{2-y}$Se${}_2$ superconductors
• Symmetry analysis of possible superconducting states in KxFe2Se2 superconductors
• Magnetic Resonant Mode in the Low-Energy Spin-Excitation Spectrum of Superconducting Rb2Fe4Se5 Single Crystals
• Nanoscale phase separation of antiferromagnetic order and superconductivity in K${}_{0.75}$Fe${}_{1.75}$Se${}_2$
• Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
• 77Se NMR Investigation of the K(x)Fe(2-y)Se(2) High Tc Superconductor (Tc=33K)
• Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb(x)Fe(2-y)Se2 single crystals
• Emergence of Fully-Gapped $s_{++}$-wave and Nodal d-wave States Mediated by Orbital- and Spin-Fluctuations in Ten-Orbital Model for KFe${}_2$Se${}_2$
• Superconducting properties of single-crystalline A_{x}Fe_{2-y}Se_{2} (A=Rb, K) studied using muon spin spectroscopy
• 77Se NMR study of pairing symmetry and spin dynamics in KyFe2-xSe2
• Anisotropic magnetism, superconductivity, and the phase diagram of Rb(1-x)Fe(2-y)Se2
• Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe(1.6+x)Se2
• Room temperature antiferromagnetic order in superconducting X_yFe_{2-x}Se_ 2, (X= Rb, K): a powder neutron diffraction study
• Optical conductivity of superconducting Rb2Fe4Se5
• Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study
• Local spin fluctuations in iron-based superconductors: 77Se and 87Rb NMR measurements of Tl0.47Rb0.34Fe1.63Se2

Cited by in corpus (64)

• Antiferromagnetic order and spin dynamics in iron-based superconductors
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Superconducting Phases in Potassium-Intercalated Iron Selenides
• Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe
• Synthesis of a new alkali metal-organic solvent intercalated iron selenide superconductor with Tc{\approx}45K
• Phase relations in K_xFe_{2-y}Se_2 and the structure of superconducting K_xFe_2Se_2 via high-resolution synchrotron diffraction
• Influence of microstructure on superconductivity in K${}_x$Fe${}_{2-y}$Se${}_2$ and evidence for a new parent phase K${}_2$Fe${}_7$Se${}_8$
• Structure, magnetic order and excitations in the 245 family of Fe-based superconductors
• Superconductivity at Tc = 44 K in LixFe2Se2(NH3)y
• Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
• Neutron-Diffraction Measurements of an Antiferromagnetic Semiconducting Phase in the Vicinity of the High-Temperature Superconducting State of K${}_x$Fe${}_{2-y}$Se${}_2$
• Nanoscale layering of antiferromagnetic and superconducting phases in Rb2Fe4Se5
• Evolution of precipitate morphology during heat treatment and its implications for the superconductivity in KxFe1.6+ySe2 single crystals
• Superconductivity and its mechanism in an ab initio model for electron-doped LaFeAsO
• Effective doping and suppression of Fermi surface reconstruction via Fe vacancy disorder in KxFe2-ySe2
• Orbital-selective metal-insulator transition and gap formation above Tc in superconducting Rb1-xFe2-ySe2
• Conformity of spin fluctuations in alkali-metal iron selenide superconductors inferred from the observation of a magnetic resonant mode in K(x)Fe(2-y)Se(2)
• Optical conductivity of iron-based superconductors
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Structure and composition of the superconducting phase in alkali iron selenide K${}_y$Fe${}_{1.6+x}$Se${}_2$
• Spin-wave excitations and superconducting resonant mode in Cs(x)Fe(2-y)Se2
• Strong and nonmonotonic temperature dependence of Hall coefficient in superconducting K${}_x$Fe${}_{2-y}$Se${}_2$ single crystals
• Spin reorientation in TlFe1.6Se2 with complete vacancy ordering
• Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
• Interplay between Superconductivity and Magnetism in Rb0.8Fe1.6Se2 under Pressure
• Superconductivity and magnetism in RbxFe2-ySe2: Impact of thermal treatment on mesoscopic phase separation
• "Cigar" Fermi surface as a possible requisite for superconductivity in iron-based superconductors
• Spin resonance in the superconducting state of Li${}_{1-x}$Fe${}_x$ODFe${}_{1-y}$Se observed by neutron spectroscopy
• High resolution characterisation of microstructural evolution in Rb${}_x$Fe${}_{2-y}$Se${}_2$ crystals on annealing
• Bandwidth and Electron Correlation-Tuned Superconductivity in Rb${}_{0.8}$Fe${}_2$(Se${}_{1-z}$S${}_z$)${}_2$
• Temperature dependence of iron local magnetic moment in phase-separated superconducting chalcogenide
• Archimedean solid-like superconducting framework in phase-separated K0.8Fe1.6+xSe2 (0<=x<=0.15)
• Effect of iron content and potassium substitution in A${}_{0.8}$Fe${}_{1.6}$Se${}_2$ (A = K, Rb, Tl) superconductors: a Raman-scattering investigation
• Effective medium approximation and the complex optical properties of the inhomogeneous superconductor K_{0.8}Fe_{2-y}Se_2
• Phase co-existence and structured diffuse scattering seen by X-ray 3D mapping of reciprocal space for Cs0.8Fe1.6Se2
• The onset of magnetism peaked around x=1/4 in optimally electron-doped LnFe(1-x)Ru(x)AsO(1-y)F(y) (Ln = La, Nd or Sm) superconductors
• Disordered Fe vacancies and superconductivity in potassium-intercalated iron selenide (K2-xFe4+ySe5)
• Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc = 42 K
• Correlated disorder to order crossover in the local structure of K${}_x$Fe${}_{2-y}$Se${}_{2-z}$S${}_z$
• Mott localization in a pure stripe antiferromagnet Rb${}_{1-\delta }$Fe${}_{1.5-\sigma }$S${}_2$
• Structural phase transition below 250 K in superconducting K${}_{0.75}$Fe${}_{1.75}$Se${}_2$
• Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe
• Elucidating the magnetic and superconducting phases in the alkali metal intercalated iron chalcogenides
• Two-dimensional Cs-vacancy superstructure in iron-based superconductor $C{s}_{0.8}F{e}_{1.6}S{e}_2$
• High-pressure single-crystal neutron scattering study of magnetic and Fe vacancy orders in (Tl,Rb)2Fe4Se5 superconductor
• Structural, magnetic, and electronic evolution of the spin-ladder system BaFe${}_2$S${}_{3-x}$Se${}_x$ with isoelectronic substitution
• Intrinsic high-temperature superconductivity in ternary iron selenides
• Spin glass in semiconducting KFe${}_{1.05}$Ag${}_{0.88}$Te${}_2$ single crystals
• Electron-phonon coupling in the superconducting single crystal Rb${}_{0.8}$Fe${}_{1.68}$Se${}_2$
• Structure, superconductivity, and magnetism in Rb1-xFe1.6Se2-zSz
• Tuning orbital-selective correlation effects in superconducting Rb${}_{0.75}$Fe${}_{1.6}$Se${}_{2-z}$S${}_z$
• Phase separation at the magnetic-superconducting transition in La${}_{0.7}$Y${}_{0.3}$FeAsO${}_{1-x}$F${}_x$
• Magnetic Properties Controlled by Interstitial or Interlayer Cations in Iron Chalcogenides
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Growth of (NaxKy)FezSe2 crystals by chlorides flux at low temperatures
• Sustained phase separation and spin glass in Co-doped K${}_x$Fe${}_{2-y}$Se${}_2$ single crystals
• Weak Spin Fluctuation with Finite Wave Vector and Superconducting Gap Symmetry in KxFe2-ySe2: 77Se Nuclear Magnetic Resonance
• Low-energy bound states at interfaces between superconducting and block antiferromagnet regions in KxFe{2-y}Se2
• Optimization of a Non-arsenic Iron-based Superconductor for Wire Fabrication
• Enhanced superconductivity and moderate spin fluctuations suppressed at low energies in heavily electron-doped La1111-based superconductor
• Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe
• Self-organized electronic superlattices in layered materials
• Phase separation in iron chalcogenide superconductor Rb0.8+xFe1.6+ySe2 as seen by Raman light scattering and band structure calculations