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. 2024 Feb 17;17(4):929. doi: 10.3390/ma17040929

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) The temperature dependence of magnetic susceptibility for BaFe₂(As_1−xBi_x)₂ single crystals with H = 1 T magnetic field. (b) The d²χ/dT² as a function of temperature according to the data from (a). (c) The temperature dependence of 1/(χ − χ₀) for x = 0.0018, 0.0020 and 0.0022 samples. The red solid lines are fits to the Curie–Weiss law. (d) The effective moment per Fe site as a function of the doping concentration x. The blue square points are our results, and the black star point is from reference [34].