Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

Shinozaki, Masaru; Hoshino, Shintaro; Yumoto, Masaki; Kishine, Jun‐ichiro; Kato, Yasuyuki

doi:10.7566/jpsj.85.074710

Cited by 68 publications

(24 citation statements)

References 29 publications

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“…Calculations in ref. 53, give J ⊥ = 1.4 × 10 2 K, J || = 15 K, and D = 2.9 K, which satisfies the requirement D / J || = 0.16 and demonstrates the strong FM interactions in the a-b plane, J ⊥ , that give a relatively high T c . Another study 54 gives the ratio of the anisotropy energy to the exchange energy as A / J ⊥ = 0.10.…”

Section: Resultsmentioning

confidence: 63%

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Clements

Das

et al. 2017

Sci Rep

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Cr1/3NbS2 is a unique example of a hexagonal chiral helimagnet with high crystalline anisotropy, and has generated growing interest for a possible magnetic field control of the incommensurate spin spiral. Here, we construct a comprehensive phase diagram based on detailed magnetization measurements of a high quality single crystal of Cr1/3NbS2 over three magnetic field regions. An analysis of the critical properties in the forced ferromagnetic region yields 3D Heisenberg exponents β = 0.3460 ± 0.040, γ = 1.344 ± 0.002, and T C = 130.78 K ± 0.044, which are consistent with the localized nature the of Cr3+ moments and suggest short-range ferromagnetic interactions. We exploit the temperature and magnetic field dependence of magnetic entropy change (ΔS M) to accurately map the nonlinear crossover to the chiral soliton lattice regime from the chiral helimagnetic phase. Our observations in the low field region are consistent with the existence of chiral ordering in a temperature range above the Curie temperature, T C < T < T*, where a first-order transition has been previously predicted. An analysis of the universal behavior of ΔS M(T,H) experimentally demonstrates for the first time the first-order nature of the onset of chiral ordering.

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Section: Resultsmentioning

confidence: 63%

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Clements

Das

et al. 2017

Sci Rep

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“…The period L 0 is independent of T , but the local magnetic moment decreases with T , and the transition to the PM state takes place at the temperature where it vanishes. The nature of the transition at T 0 is not fully understood and considerable effort is being devoted to clarify this interesting question [9][10][11][12][13][14][15] . At temperatures lower than T 0 , application of a magnetic field perpendicular to the DM axis deforms the helix and a chiral soliton lattice (CSL) appears 6,7,[16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

2017

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The phase diagram of the monoaxial chiral helimagnet as a function of temperature (T ) and magnetic field with components perpendicular (Hx) and parallel (Hz) to the chiral axis is theoretically studied via the variational mean field approach in the continuum limit. A phase transition surface in the three dimensional thermodynamic space separates a chiral spatially modulated phase from a homogeneous forced ferromagnetic phase. The phase boundary is divided into three parts: two surfaces of second order transitions of instability and nucleation type, in De Gennes terminology, are separated by a surface of first order transitions. Two lines of tricritical points separate the first order surface from the second order surfaces. The divergence of the period of the modulated state on the nucleation transition surface has the logarithmic behavior typical of a chiral soliton lattice. The specific heat diverges on the nucleation surface as a power law with logarithmic corrections, while it shows a finite discontinuity on the other two surfaces. The soliton density curves are described by a universal function of Hx if the values of T and Hz determine a transition point lying on the nucleation surface; otherwise, they are not universal.

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“…As is known, when H ⊥ c, a possible CMS phase may appear by modulation of external field [33,35]. The magnetic steps with loops for H ⊥ c might be correlated to the transition from the possible CMS to forced ferromagnetic state [42,44]. Theoretical calculation has suggested that magnetic loops caused by intrinsic magnetic hysteresis appear in a CMS system due to the surface barrier [44,45].…”

Section: Resultsmentioning

confidence: 99%

“…The magnetic steps with loops for H ⊥ c might be correlated to the transition from the possible CMS to forced ferromagnetic state [42,44]. Theoretical calculation has suggested that magnetic loops caused by intrinsic magnetic hysteresis appear in a CMS system due to the surface barrier [44,45]. Moreover, the transition from CMS phase to FFM state is incommensurate-to-commensurate one of the first-order type [9,44].…”

Section: Resultsmentioning

confidence: 99%

Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉

et al. 2020

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Two-dimensional layered YbNi 3 Al 9 exhibits a chiral helimagnetic ground state, which is a candidate for the field-modulated chiral magnetic soliton. In this work, the magnetism and critical phenomenon of YbNi 3 Al 9 are investigated. As H ⊥ c, a magnetic step with loop can be observed in the fielddependent magnetization, which may be corresponding to the possible chiral magnetic soliton phase transition. Based on the analysis of isothermal magnetization around T C , the critical exponents are obtained as β=0.1370(2), γ=1.7955(4), and δ=14.1043 (7), which fulfill the Widom scaling relation and Rushbrooke's law. Moreover, the obtained critical exponents are testified by the modified Arrott plot and scaling hypothesis. The critical exponents of YbNi 3 Al 9 are close to the theoretically prediction of 2D-Ising model with the spatial-dimensionality n=2 and spin-dimensionality d=1, indicating one-dimensional magnetic coupling in the two-dimensional framework. Based on universality scaling, we construct the detailed H-T phase diagram around the phase transition with H ⊥ c, which reveals that the field-induced magnetic transition for H ⊥ c is of the first-order type.

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Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

Cited by 68 publications

References 29 publications

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉

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Finite-Temperature Properties of Three-Dimensional Chiral Helimagnets

Cited by 68 publications

References 29 publications

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Critical Behavior and Macroscopic Phase Diagram of the Monoaxial Chiral Helimagnet Cr1/3NbS2

Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields

Critical phenomenon of the layered chiral helimagnetic YbNi3Al9

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Product

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Critical phenomenon of the layered chiral helimagnetic YbNi₃Al₉