Disorder-induced damping of spin excitations in Cr-doped BaFe$_2$As$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912839601487872 |
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| author | Cantarino, Marli R. Teixeira, Rafael M. P. Pakuszewski, R. Neto, Wagner R. da Silva de Abrantes, Juliana G. Garcia-Fernandez, Mirian Pagliuso, P. G. Adriano, C. Monney, Claude Schmitt, Thorsten Andrade, Eric C. Garcia, Fernando A. |
| author_facet | Cantarino, Marli R. Teixeira, Rafael M. P. Pakuszewski, R. Neto, Wagner R. da Silva de Abrantes, Juliana G. Garcia-Fernandez, Mirian Pagliuso, P. G. Adriano, C. Monney, Claude Schmitt, Thorsten Andrade, Eric C. Garcia, Fernando A. |
| contents | 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(Fe$_{1-x}$Cr$_x$)$_2$As$_{2}$ (CrBFA) by high-resolution resonant inelastic x-ray scattering (RIXS) 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 (ARPES) show increased electronic localization and a suppression of the nematic $d_{xz}/d_{yz}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_00242 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Disorder-induced damping of spin excitations in Cr-doped BaFe$_2$As$_2$ Cantarino, Marli R. Teixeira, Rafael M. P. Pakuszewski, R. Neto, Wagner R. da Silva de Abrantes, Juliana G. Garcia-Fernandez, Mirian Pagliuso, P. G. Adriano, C. Monney, Claude Schmitt, Thorsten Andrade, Eric C. Garcia, Fernando A. Superconductivity Strongly Correlated Electrons 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(Fe$_{1-x}$Cr$_x$)$_2$As$_{2}$ (CrBFA) by high-resolution resonant inelastic x-ray scattering (RIXS) 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 (ARPES) show increased electronic localization and a suppression of the nematic $d_{xz}/d_{yz}$ 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. |
| title | Disorder-induced damping of spin excitations in Cr-doped BaFe$_2$As$_2$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.00242 |