Incoherent electronic band states in Mn-substituted BaFe2 As2

Cantarino, Marli R.; Pakuszewski, Kevin R.; Salzmann, Björn; Moya, Pedro A.; Neto, Wagner Silva; Freitas, Gabriel S.; Pagliuso, P. G.; Brito, Walber H.; Monney, Claude; Adriano, C.; Garcia, Fernando A.

doi:10.1103/physrevb.108.245124

Incoherent electronic band states in Mn-substituted BaFe2 As2

Journal Article · Fri Dec 08 00:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.245124· OSTI ID:2558048

^[1]; ^[2]; Salzmann, Björn ^[3]; ^[4]; ^[4]; Freitas, Gabriel S. ^[2]; Pagliuso, P. G. ^[5]; ^[6]; ^[3]; Adriano, C. ^[2]; ^[4]

Univ. of Sao Paulo (Brazil); Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP (Brazil). Brazilian Synchrotron Light Laboratory (LNLS); European Synchrotron Radiation Facility (ESRF), Grenoble (France)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
University of Fribourg (Switzerland)
Univ. of Sao Paulo (Brazil)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Universidade Federal de Minas Gerais, Belo Horizonte (Brazil)

Chemical substitution is commonly used to explore new ground states in materials, yet the role of disorder is often overlooked. In Mn-substituted BaFe₂⁢As₂ (MnBFA), superconductivity (SC) is absent, despite being observed for nominal hole-doped phases. Instead, a glassy magnetic phase emerges, associated with the S = 5/2 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. Further, 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 (E_B) dependence of the imaginary part of the self-energy [Im⁡Σ⁡(E_B)] is best described by a fractional scaling (Im⁡Σ⁡(E_B)∝$$\sqrt-E_{B}$$). These results indicate that Mn tunes MnBFA into an electronic disordered phase between the correlated Hund's metal in BaFe₂⁢As₂ and the Hund's insulator in BaMn₂⁢As₂.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2558048

Report Number(s):: LA-UR--23-22989

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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