Different Critical Exponents on Two Sides of a Transition: Observation of Crossover from Ising to Heisenberg Exchange in Skyrmion Host 
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Chauhan, Harish Chandr; Kumar, Birendra; Tiwari, Ankita; Tiwari, Jeetendra Kumar; Ghosh, Subhasis

doi:10.1103/physrevlett.128.015703

Cited by 20 publications

(2 citation statements)

References 42 publications

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“…The effect of anisotropy plays an vital role in Co-Zn-Mn alloys [32,65], the critical exponents will be facilitated by DMI, anisotropy below T C , symmetric exchange interaction. Similar anisotropic effect is also detected in cubic chiral skyrmion host Cu 2 OSeO 3 , in which the magnetocrystalline anisotropy and anisotropy due to spin-orbit coupling increases the DMI, leading to a 3D Ising-type interaction below T C [75]. For comparison, the exponents of Fe 0.8 Co 0.2 Si are close to the 3D Heisenberg model [72], exhibiting an isotropic short-range magnetic coupling.…”

Section: Critical Behaviorsupporting

confidence: 69%

“…The critical behavior of the Bloch-type skyrmion hosts Fe 0.8 Co 0.2 Si and FeGe can be described by the 3D Heisenberg theory [71,72], while MnSi approaches the tricritical mean-field model [59]. For Cu 2 OSeO 3 , its critical exponents are characterized by the 3D Heisenberg theory above T C [73,75]. The effect of anisotropy plays an vital role in Co-Zn-Mn alloys [32,65], the critical exponents will be facilitated by DMI, anisotropy below T C , symmetric exchange interaction.…”

Section: Critical Behaviormentioning

confidence: 99%

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Critical behavior and magnetic entropy change of skyrmion host Co₇Zn₈Mn₅

Yang

Pan

et al. 2022

New J. Phys.

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The magnetic properties of a β-Mn-type alloy Co7Zn8Mn5, which is a chiral magnet hosting skyrmion phase, are comprehensively investigated, exhibiting a ferromagnetic transition around 184 K and a spin freezing near 20 K. The generated Rhodes-Wolfarth ratio (RWR) equals 1.10, which indicates a weak itinerant character of the ferromagnetism in Co7Zn8Mn5. The spin dynamics of the spin freezing agrees with the universal scaling law of critical slowing down with τ0 = 1.7 × 10−5 s, Tg = 20.2 K, and zν = 3.92. Critical exponents β = 0.423(1) and γ = 1.366(4) are deduced by the modified Arrott plot, whereas δ = 4.22(2) is obtained by a critical isotherm analysis. The validity of the deduced critical exponents is verified by the Widom scaling relation and the scaling hypothesis. The boundary between the first-order and the second-order phase transition is evaluated by a scaling analysis. The magnetic interaction, obtained by a renormalization group theory, decays with distance r as J(r) ≈ r−4.9 , lying between the mean-field model and the 3D Heisenberg model. The analyses on critical behavior could shed new light on the origin of ferromagnetism and topological Hall effect. Moreover, the magnetic entropy change −∆SM exhibits a maximal value around TC , and the peak position gradually raises with an increasing fields, eliminating the mean-field model. The −∆SM max features a power-law behavior with n > 2/3, excluding any universal standard models of ferromagnetism. The −∆SM(T,H) plots can be scaled into a universal curve, further verifying the reliability and accuracy of the yielded critical exponents.

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