Charge-Stripe Order in a Parent Compound of Iron-based Superconductors

Abstract

Charge ordering is one of the most intriguing and extensively studied phenomena in correlated electronic materials because of its strong impact on electron transport properties including superconductivity. Despite its ubiquitousness in correlated systems, the occurrence of charge ordering in iron-based superconductors is still unresolved. Here we use scanning tunneling microscopy to reveal a long-range charge-stripe order and a highly anisotropic dispersion of electronic states in the ground state of stoichiometric FeTe, the parent compound of the Fe(Te, Se, S) superconductor family. The formation of charge order in a strongly correlated electron system with integer nominal valence (here Fe${}^{2+}$) is unexpected and suggests that the iron-based superconductors may exhibit more complex charge dynamics than originally expected. We show that the present observations can be attributed to the surpassing of the role of local Coulomb interaction by the poorly screened longer-range Coulomb interactions, facilitated by large Hund's rule coupling.

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Cited by in corpus (11)

• Evidence for interfacial superconductivity in a bi-collinear antiferromagnetically ordered FeTe monolayer on a topological insulator
• Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe2As2
• Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling
• Phase Competition and Anomalous Thermal Evolution in High-Temperature Superconductors
• Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds
• Molecular beam epitaxy preparation and in situ characterization of FeTe thin films
• The design and the performance of an ultrahigh vacuum 3He fridge-based scanning tunneling microscope with a double deck sample stage for in-situ tip treatment
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• Enhanced spin ordering temperature in ultrathin FeTe films grown on a topological insulator
• Trion formation and unconventional superconductivity in a three-dimensional model with short-range attraction
• Interfacial superconductivity induced by single-quintuple-layer Bi${}_2$Te${}_3$ on top of FeTe forming van-der-Waals heterostructure