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  • Letter
  • Open Access

Disorder-induced damping of spin excitations in Cr-doped BaFe2As2

Marli R. Cantarino1,*, Rafael M. P. Teixeira2, K. R. Pakuszewski3, Wagner R. da Silva Neto4, Juliana G. de Abrantes5, Mirian Garcia-Fernandez6, P. G. Pagliuso7, C. Adriano3, Claude Monney8 et al.

Thorsten Schmitt9, Eric C. Andrade2, and Fernando A. Garcia2,†

  • *Contact author: marli.cantarino@esrf.fr
  • †Contact author: fgarcia@if.usp.br
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Phys. Rev. Research 8, L012028 – Published 2 February, 2026

DOI: https://doi.org/10.1103/rkjn-hf7z

Abstract

In doped Hund's metals, such as the iron-based superconductors, effects like charge doping and chemical pressure are often considered the dominant factors. Partial chemical substitution, however, inevitably introduces disorder. Here, we investigate spin excitations in Ba(Fe1−xCrx)2As2 (CrBFA) by high-resolution resonant inelastic x-ray scattering for samples with x=0,0.035, and 0.085. In CrBFA, Cr acts as a hole dopant, but also introduces localized spins that compete with Fe-derived magnetic excitations. We found that the Fe-derived magnetic excitations are softened and damped, becoming overdamped for x=0.085. At this doping level, complementary angle-resolved photoemission spectroscopy measurements show increased electronic localization and a suppression of the nematic dxz/dyz band splitting present in the parent compound. We thus propose a localized spin model that explicitly incorporates substitutional disorder and Cr local moments, successfully reproducing our key observations. Our findings reveal a case where disorder dominates over charge doping in the case of a Hund's metal.

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Phys. Rev. Research 8, L012028– Published 2 February, 2026
  • Received 5 September 2025
  • Accepted 12 January 2026
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