Incoherent electronic band states in Mn-substituted BaFeAs
arXiv:2307.12879 · doi:10.1103/PhysRevB.108.245124
Abstract
Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder is often overlooked. In Mn-substituted BaFeAs (MnBFA), superconductivity (SC) is absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with the Mn local spins. In this work, we present a comprehensive investigation of the electronic structure of MnBFA using angle-resolved photoemission spectroscopy (ARPES). We find that Mn causes a small and orbital-specific reduction of the electron pockets, only partially disrupting nesting conditions. Based upon the analysis of the spectral properties, we observe, for all bands, an increase in the electronic scattering rate as a function of Mn content. This is interpreted as increasing band incoherence, which we propose as the primary contributor to the suppression of the magnetic order in MnBFA. This finding connects the MnBFA electronic band structure properties to the glassy magnetic behavior observed in these materials and suggests that SC is absent because of the collective magnetic impurity behavior that scatters the Fe-derived excitations. Additionally, our analysis shows that the binding energy () dependence of the imaginary part of the self-energy [] is best described by a fractional scaling (). These results indicate that Mn tunes MnBFA into an electronic disordered phase between the correlated Hund's metal in BaFeAs and the Hund's insulator in BaMnAs.
main 8 pages, 5 figures + supp 5 pages, 4 figures
References in corpus (33)
- Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
- Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
- Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
- Iron-Based Superconductors: current status of materials and pairing mechanism
- Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe(AsP)
- Ironing out the details of unconventional superconductivity
- Superconductivity induced by Ni doping in BaFeAs
- Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
- Where Are the Extra d Electrons in Transition-Metal Substituted Fe Pnictides?
- Low-energy microscopic models for iron-based superconductors: a review
- Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2
- Dependence of carrier doping on the impurity potential in transition-metal-substituted FeAs-based superconductors
- Extraordinary quasiparticle scattering and bandwidth-control by dopants in iron-based superconductors
- Superconductivity at 23 K and Low Anisotropy in Rb-Substituted BaFe_2As_2 Single Crystals
- Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
- Probing the role of Co substitution in the electronic structure of iron-pnictides
- Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
- Dynamic competition between spin density wave order and superconductivity in underdoped
- Electronic Griffiths phase of the d=2 Mott transition
- Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
- Unconventional disorder effects in correlated superconductors
- Detailed band structure of twinned and detwinned BaFeAs studied with angle-resolved photoemission spectroscopy
- Spin and Orbital Characters of Excitations in Iron Arsenide Superconductors Revealed by Simulated Fe L-Edge RIXS
- Local and collective magnetism of EuFeAs
- Effective model of the electronic Griffiths phase
- Optical properties of the iron-pnictide analog BaMn2As2
- Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe(AsP)
- Anisotropic magnetic excitations and incipient Néel order in Ba(FeMn)As
- Superconductivity and phase diagrams of CaK(FeMn)As single crystals
- Importance of dxy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system
- Superconductivity and magnetic and transport properties of single-crystalline CaK(FeCr)As
- Orbital localization and the role of the Fe and As orbitals in BaFeAs probed by XANES
- Carrier localization due to local magnetic order induced by magnetic impurities in Ba(FeTM)As (TM = Mn and Cr) as seen via optical spectra