Charge-density wave, superconductivity and $f$-electron valence instability in EuBiS${}_2$F

Abstract

Superconductivity (SC) and charge-density wave (CDW) are two contrasting yet relevant collective electronic states which have received sustained interest for decades. Here we report that, in a layered europium bismuth sulfofluoride, EuBiS${}_2$F, a CDW-like transition occurs at 280 K, below which SC emerges at 0.3 K, without any extrinsic doping. The Eu ions were found to exhibit an anomalously temperature-independent mixed valence of about +2.2, associated with the formation of CDW. The mixed valence of Eu gives rise to self electron doping into the conduction bands mainly consisting of the in-plane Bi-6$p$ states, which in turn brings about the CDW and SC. In particular, the electronic specific-heat coefficient is enhanced by ~ 50 times, owing to the significant hybridizations between Eu-4$f$ and Bi-6$p$ electrons, as verified by band-structure calculations. Thus, EuBiS${}_2$F manifests itself as an unprecedented material that simultaneously accommodates SC, CDW and $f$-electron valence instability.

10 pages, 6 figures

References in corpus (27)

• Long-range incommensurate charge fluctuations in (Y,Nd)Ba2Cu3O(6+x)
• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Superconductivity in Cu_xTiSe_2
• Magnetic-field-induced charge-stripe order in the high temperature superconductor YBa2Cu3Oy
• Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
• Electronic crystals: an experimental overview
• Superconductivity in novel BiS2-based layered superconductor LaO1-xFxBiS2
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Minimal electronic models for superconducting BiS${}_2$ layers
• Concepts relating magnetic interactions, intertwined electronic orders and strongly correlated superconductivity
• Ferroelectric Soft Phonons, Charge Density Wave Instability and Strong Electron-Phonon Coupling in BiS2-Layered Superconductors
• Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
• Density-functional calculations of the electronic structure and lattice dynamics of superconducting LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$: Evidence for an electron-phonon interaction near the charge-density-wave instability
• Superconductivity induced by electron doping in the system La1-xMxOBiS2 (M = Ti, Zr, Hf, Th)
• Appearance of superconductivity in new BiS2 based layered LaO0.5F0.5BiS2
• Electronic structure and superconductivity of BiS2-based compounds LaO1-xFxBiS2
• New layered fluorosulfide SrFBiS2
• Pairing with dominant triplet component and possible weak topological superconductivity in BiS${}_2$-based superconductors
• RPA Analysis of a Two-orbital Model for the BiS2-based Superconductors
• Insulator-to-Superconductor Transition upon Electron Doping in a BiS${}_2$-Based Superconductor Sr${}_{1-x}$La${}_x$FBiS${}_2$
• Self doping effect and successive magnetic transitions in superconducting Sr${}_2$VFeAsO${}_3$
• Checkerboard stripe electronic state on cleaved surface of NdO${}_{0.7}$F${}_{0.3}$BiS${}_2$ probed by scanning tunneling microscope
• Optical study of archetypical valence-fluctuating Eu-systems
• Electronic phase diagram in the new BiS2-based Sr1-xLaxFBiS2 system
• Anisotropic upper critical field of BiS2-based superconductor LaO0.5F0.5BiS2
• A brief comment on the chemical formulae of the rare earth iron arsenide oxide superconductors

Cited by in corpus (44)

• In-plane chemical pressure essential for superconductivity in BiCh2-based (Ch: S, Se) layered structure
• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Anomalous Eu Valence State and Superconductivity in Undoped Eu3Bi2S4F4
• Evolution of superconductivity in BiS2-based superocnductor LaO0.5F0.5Bi(S1-xSex)2
• Enhancement of thermoelectric properties by Se substitution in layered bismuth-chalcogenide LaOBiS2-xSex
• Pressure-enhanced superconductivity in Eu${}_3$Bi${}_2$S${}_4$F${}_4$
• Weak phonon-mediated pairing in BiS${}_2$ superconductor from first principles
• Superconductivity in CeOBiS2 with cerium valence fluctuation
• Bulk Superconductivity Induced by In-plane Chemical Pressure Effect in Eu0.5La0.5FBiS2-xSex
• Unusual mixed valence of Eu in two new materials EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray photoemission Spectroscopy investigations
• Crystal structure, site selectivity, and electronic structure of layered chalcogenide LaOBiPbS3
• Superconductivity in layered Oxychalcogenide La2O2Bi3AgS6
• Pressure-Induced Phase Transition in La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Pressure-Induced Superconductivity in BiS2-based EuFBiS2
• Pressure enhanced superconductivity at 10 K in La doped EuBiS2F
• Granular superconductivity below 5~K in SPI-II pyrolytic graphite
• Electronic and magnetic properties of superconducting LnO${}_{1-x}$F${}_x$BiS${}_2$ (Ln = La, Ce, Pr, and Nd) from first principles
• Synthesis, Crystal Structure, and Physical Properties of New Layered Oxychalcogenide La2O2Bi3AgS6
• Synthesis, Crystal Structure, and Thermoelectric Properties of Layered Antimony Selenides REOSbSe2 (RE = La, Ce)
• Electrical and Thermal Transport of Layered Bismuth-chalcogenide EuBiS2F at temperatures between 300 and 623 K
• Enhancement of Tc in BiS2 based superconductors NdO0.7F0.3BiS2 by substitution of Pb for Bi
• Growth and characterization of R(O,F)BiS2 (R = La, Ce, Pr, Nd) superconducting single crystals
• Coexistence of superconductivity and complex 4$f$ magnetism in Eu${}_{0.5}$Ce${}_{0.5}$BiS${}_2$F
• High pressure effects on non-fluorinated BiS2-based superconductors La${}_{1-x}$M${}_x$OBiS${}_2$ (M = Ti and Th)
• Role of valence changes and nanoscale atomic displacements in BiS2-based superconductors
• Pressure-Induced Superconductivity in Layered Transition-metal Chalcogenides (Zr,Hf)GeTe${}_4$ Explored by Data-driven Approach
• Effect of Lead Substitution on LaO0.5F0.5BiS2
• Superconductivity in La1-xCexOBiSSe: carrier doping by mixed valence of Ce ions
• Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions
• Observation of supermodulation in LaO0.5F0.5BiSe2 by scanning tunneling microscopy and spectroscopy
• Growth and characterization of (La,Ce)OBiS2 single crystals
• Enhanced thermoelectricity by controlled local structure in bismuth-chalcogenides
• Lattice Anharmonicity in BiS2-Based Layered Superconductor RE(O,F)BiS2 (RE = La, Ce, Pr, Nd)
• Bulk superconductivity induced by Se substitution in self-doped BiCh2-based compound CeOBiS2-xSex
• Pressure tuning of localization and superconductivity in LaOPbBiS${}_3$ and La${}_2$O${}_2$Bi${}_3$AgS${}_6$
• Superconductivity in Se-doped La2O2Bi2Pb2S6-xSex with a Bi2Pb2Ch4-type thick conducting layer
• Growth and superconducting properties of Cd-doped La(O,F)BiS2 single crystals
• Pressure-induced enhancement of the superconducting transition temperature in La2O2Bi3AgS6
• Bulk superconductivity in La2O2M4S6-type layered oxychalcogenide La2O2Bi3Ag0.6Sn0.4S5.7Se0.3
• Effect of Indium doping on the superconductivity of layered oxychalcogenide La2O2Bi3Ag1-xInxS6
• Chemical Substitution and High Pressure Effects on Superconductors in the $Ln$OBiS${}_2$ ($Ln$ = La-Nd) System
• Pressure-induced superconductivity in TiGeTe${}_6$
• Evaluation of insulating behavior by Pb Substitution and Pressure-Induced Superconductivity in La2O2Bi3-xPb1+xS6
• The upper critical field in the BiCh2-based superconductors CeOBiS1.7Se0.3 and PrO0.5F0.5BiS2-xSex (x = 0, 0.3)