Hole doping and electronic correlations in Cr substituted BaFe2As2

Autor(es)

Cantarino, Marli dos Reis ; Pakuszewski, Kevin R. ; Salzmann, Bjoern ; Moya, Pedro H. A. ; Neto, Wagner R. da Silva ; Freitas, Gabriel S. ; Pagliuso, Pascoal G. ; Adriano, Cris ; Brito, Walber H. ; Garcia, Fernando A.

• Tipo de documento: Artigo Científico
• Fonte: SCIPOST PHYSICS; v. 17, n. 5, p. 17-pg., 2024-11-01.

Resumo

For a significant composition range, the suppression of the spin density wave transition temperature ( T SDW ) in Cr- and Mn-substituted BaFe2As2 (CrBFA and MnBFA, respectively) coincides as a function of Cr/Mn content, despite the distinct electronic effects of these substitutions. Additionally, for any Cr/Mn content superconductivity (SC) is absent and this topic is particularly less explored in the case of CrBFA. In this work, we employ angle- resolved photoemission spectroscopy (ARPES) and combined density functional theory plus dynamical mean field theory (DFT+DMFT) to address the evolution of the Fermi surface (FS) and electronic correlations in CrBFA. Our findings reveal that incorporating Cr leads to an effective hole doping of the states near the FS, which is well described within the virtual crystal approximation (VCA). Moreover, analysis of the ARPES spectra of the bands with main d ye-orbital character reveals a fractional scaling of the imaginary part of self-energy as a function of the binding energy, a signature property of Hund's correlations. Our DFT+DMFT calculations support these experimental findings. We conclude that CrBFA is a correlated electron system for which the changes in the FS as a function of Cr are unrelated to the suppression of T SDW . In addition, we suggest that the absence of SC is primarily due to the competition between Cr local moments and the Fe-derived itinerant spin fluctuations. (AU)

• Processo FAPESP: 20/13701-0 - Estudo da estrutura eletrônica em supercondutores baseados em ferro usando ARPES
• Beneficiário: Marli dos Reis Cantarino
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 19/25665-1 - Instabilidades de carga e spin em supercondutores não convencionais
• Beneficiário: Fernando Assis Garcia
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/05150-7 - Estrutura eletrônica e excitações magnéticas de supercondutores magnéticos
• Beneficiário: Marli dos Reis Cantarino
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais