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. 2020 Oct 14;10:17274. doi: 10.1038/s41598-020-74156-z

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Inset: Time t dependence of the absolute value of the irreversible DC magnetic moment ∣m_irr∣ in log–log scales for P-Ba122od in H = 30 kOe (applied in ZFC conditions) at several temperatures T ≥ 18 K. In this representation, the relaxation curves are linear, with the slope of the linear fit (the continuous line) supplying the normalized magnetization relaxation rate S = − dln(∣m_irr∣)/dln(t) and the corresponding normalized vortex-creep activation energy U* = T/S. Main panel: The resulting U*(T) variation exhibits a maximum at the creep-crossover temperature T_cr, signalling the vortex system disordering across the second magnetization peak.