Kondo interaction in FeTe and its potential role in the magnetic order

Abstract

Finding d-electron heavy fermion (HF) states has been an important topic as the diversity in d-electron materials can lead to many exotic Kondo effect-related phenomena or new states of matter such as correlation-driven topological Kondo insulator or cooperation between long-range magnetism and Kondo lattice behavior. Yet, obtaining direct spectroscopic evidence for a d-electron HF system has been elusive to date. Here, we report the observation of Kondo lattice behavior in an antiferromagnetic metal, FeTe, via angle-resolved photoemission spectroscopy (ARPES) and transport properties measurements. The Kondo lattice behavior is represented by the emergence of a sharp quasiparticle at low temperatures. The transport property measurements confirm the low-temperature Fermi liquid behavior and reveal successive coherent-incoherent crossover upon increasing temperature. We interpret the Kondo lattice behavior as a result of hybridization between localized Fe 3dxy and itinerant Te 5pz orbitals. Our interpretation is further evidenced by Fano-type tunneling spectra which accompany a hybridization gap. Our observations strongly suggest unusual cooperation between Kondo lattice behavior and long-range magnetic order.

17 pages, 6 figures

References in corpus (16)

• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• From (pi, 0) magnetic order to superconductivity with (pi, pi) magnetic resonance in Fe1.02(Te1-xSex)
• Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Rb) Superconductors
• Hund's coupling key role in multi-orbital correlations
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• The underscreened Kondo lattice model applied to heavy fermion uranium compounds
• Additional energy scale in SmB${}_6$ at low temperature
• Non-Thermal Emergence of an Orbital-Selective Mott Phase in FeTe${}_{1-x}$Se${}_x$
• Correlation-Driven Electronic Reconstruction in FeTe${}_{1-x}$Se${}_x$
• Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe1.02Te using Angle-Resolved Photoemission Spectroscopy
• Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs
• Is the orbital-selective Mott phase stable against interorbital hopping?
• Pressure induced ferromagnetism in antiferromagnetic Fe_1.03Te
• Doniach diagram for ordered, disordered and underscreened Kondo lattices
• Breakdown of single spin-fluid model in heavily hole-doped superconductor CsFe2As2

Cited by in corpus (1)

• Dispersion kinks from electronic correlations in an unconventional iron-based superconductor