SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 49: Critical Phenomena and Phase Transitions
DY 49.2: Vortrag
Donnerstag, 30. März 2023, 15:15–15:30, ZEU 160
On the criticality of structurally disordered magnets — Maxym Dudka1,2, Mariana Krasnytska1,2,3, Juan Ruiz-Lorenzo4,5, and •Yurij Holovatch1,2,6 — 1ICMP, NAS of Ukraine, Lviv, Ukraine — 2L4 Collaboration Leipzig-Lorraine-Lviv-Coventry, Europe — 3Université de Lorraine, Nancy, France — 4Universidad de Extremadura, Badajoz, Spain — 5BIFI, Zaragoza, Spain — 6Coventry University, Coventry, UK
We discuss the problem of influence of structural disorder on criticality. As a case study, we consider an impact of a weak quenched disorder on a magnetic phase transition. Usually, such an impact is analyzed for a two-component mixture (e.g. a solid solution of a magnet with its non-magnetic counterpart). A distinct feature of our analysis is consideration of changes in the magnetic phase transition when both components are magnets. To this end, we make use of a generalized Ising model suggested recently [M. Krasnytska et al., J.Phys.: Complexity 1 (2020) 035008] in a context of complex systems. We apply the field theoretical renormalization group approach to analyze its effective and asymptotic critical behaviour. We show that this is the structural disorder itself that causes changes in the universal critical behaviour, regardless of whether it has a form of a random mixture of magnetic and non-magnetic constituents or of two different magnetic compounds [M. Dudka et al., arXiv:2207.13655].