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- W4311184491 abstract "Recently, a colossal magnetoresistance (CMR) was observed in $mathrm{Eu}{mathrm{Cd}}_{2}{mathrm{P}}_{2}$, a compound that does not fit the conventional mixed-valence paradigm. Instead, experimental evidence points to a resistance driven by strong magnetic fluctuations within the two-dimensional ferromagnetic planes of the layered antiferromagnetic structure. While the experimental results have not yet been fully understood, a recent theory relates the CMR to a topological vortex-antivortex unbinding, i.e., Berezinskii-Kosterlitz-Thouless (BKT), phase transition. Motivated by these observations, in this work we explore the magnetic phases hosted by a microscopic classical magnetic model for $mathrm{Eu}{mathrm{Cd}}_{2}{mathrm{P}}_{2}$, which easily generalizes to other Eu A-type antiferromagnetic compounds. Using Monte Carlo techniques to probe the specific heat and the helicity modulus, we show that our model can exhibit a vortex-antivortex unbinding phase transition. We find that this phase transition displays the same sensitivity to in-plane magnetization, interlayer coupling, and easy-plane anisotropy that is observed experimentally in the CMR signal, providing qualitative numerical evidence that the effect is related to a magnetic BKT transition." @default.
- W4311184491 created "2022-12-24" @default.
- W4311184491 creator A5010898852 @default.
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- W4311184491 date "2022-12-02" @default.
- W4311184491 modified "2023-10-17" @default.
- W4311184491 title "Topological magnetic phase transition in Eu-based <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>A</mml:mi></mml:math> -type antiferromagnets" @default.
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- W4311184491 doi "https://doi.org/10.1103/physrevb.106.214402" @default.
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