Probing putative orbital differentiation effects via Eu2+ spin dynamics in Sr1-xEuxFe2As2

Radaelli, M.; Piva, M. M.; Souza, J. C.; Lesseux, G. G.; Jesus, C. B. R.; Tobia, D.; Urbano, R. R.; Rosa, Priscila F. S.; Giglio Pagliuso, Pascoal Jose

doi:10.1103/physrevb.107.134512

Title: Probing putative orbital differentiation effects via Eu²⁺ spin dynamics in Sr_1-xEu_xFe₂As₂

Journal Article · 11 April 2023 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.107.134512 · OSTI ID:1989160

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^[3]; Lesseux, G. G. ^[1]; Jesus, C. B. R. ^[4]; Tobia, D. ^[5];

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Univ. of Campinas (UNICAMP), Sao Paulo (Brazil)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Weizmann Institute of Science, Rehovot (Israel)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Universidade Federal de Sergipe (Brazil)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); National Atomic Energy Commission (CNEA-CONICET), Rio Negro (Argentina)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Here, in this work, we report x-ray powder diffraction, elemental analysis, electrical resistivity, magnetic susceptibility, specific heat, and electron spin resonance (ESR) in single crystals of Sr_1-xEu_xFe₂As₂. We observed a breakdown of the previously reported scaling between the Eu²⁺ Korringa relaxation rate obtained from ESR and the spin density wave temperature evolution for Sr-rich samples. This result suggests a distinct evolution of the orbital differentiation of the Fe 3d bands along the Sr-based series when compared to the Ba counterpart. We argue that this difference is related to a larger splitting between the structural (tetragonal-to-orthorhombic) and the Fe-driven spin density wave transitions induced by Eu doping in this series. In fact, our results indicate that the two transitions follow an opposite x-Eu dependence for Sr-concentrated samples. Our work shows that Sr_1-xEu_xFe₂As₂ series and the comparison with their Ba-based counterparts are exciting platforms to be explored for understanding the interplay among orbital differentiation, magnetism, and structural distortions in the iron pnictides

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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:: 1989160

Report Number(s):: LA-UR-22-31186

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 13 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Probing putative orbital differentiation effects via Eu2+ spin dynamics in Sr1-xEuxFe2As2

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Title: Probing putative orbital differentiation effects via Eu²⁺ spin dynamics in Sr_1-xEu_xFe₂As₂