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• W3178204847 abstract "Abstract The electronic ground state of iron-based materials is unusually sensitive to electronic correlations. Among others, its delicate balance is profoundly affected by the insertion of magnetic impurities in the FeAs layers. Here, we address the effects of Fe-to-Mn substitution in the non-superconducting Sm-1111 pnictide parent compound via a comparative study of SmFe $$_{1-x}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mrow /> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>-</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> </mml:math> Mn $$_{x}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mrow /> <mml:mi>x</mml:mi> </mml:msub> </mml:math> AsO samples with $$x(text{Mn})=$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>x</mml:mi> <mml:mo>(</mml:mo> <mml:mtext>Mn</mml:mtext> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> </mml:mrow> </mml:math> 0.05 and 0.10. Magnetization, Hall effect, and muon-spin spectroscopy data provide a coherent picture, indicating a weakening of the commensurate Fe spin-density-wave (SDW) order, as shown by the lowering of the SDW transition temperature $$T_text{SDW}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>T</mml:mi> <mml:mtext>SDW</mml:mtext> </mml:msub> </mml:math> with increasing Mn content, and the unexpected appearance of another magnetic order, occurring at $$T^{*} approx 10$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>T</mml:mi> <mml:mrow> <mml:mrow /> <mml:mo>∗</mml:mo> </mml:mrow> </mml:msup> <mml:mo>≈</mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:math> and 20 K for $$x=0.05$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>x</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0.05</mml:mn> </mml:mrow> </mml:math> and 0.10, respectively. We attribute the new magnetic transition at $$T^{*}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>T</mml:mi> <mml:mrow> <mml:mrow /> <mml:mo>∗</mml:mo> </mml:mrow> </mml:msup> </mml:math> , occurring well inside the SDW phase, to a reorganization of the Fermi surface due to Fe-to-Mn substitutions. These give rise to enhanced magnetic fluctuations along the incommensurate wavevector $$varvec{Q}_2 =(pi pm delta ,pi pm delta )$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>Q</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> <mml:mo>=</mml:mo> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> <mml:mi>δ</mml:mi> <mml:mo>,</mml:mo> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> <mml:mi>δ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> , further increased by the RKKY interactions among Mn impurities." @default.
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• W3178204847 date "2021-07-13" @default.
• W3178204847 modified "2023-10-18" @default.
• W3178204847 title "Mn-induced Fermi-surface reconstruction in the SmFeAsO parent compound" @default.
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• W3178204847 doi "https://doi.org/10.1038/s41598-021-93625-7" @default.
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