Confinement of Chiral Magnetic Modulations in the Precursor Region of FeGe

Abstract

We report on magnetic susceptibility and specific heat measurements of the cubic helimagnet FeGe in external magnetic fields and temperatures near the onset of long-range magnetic order at T_C=278.2(3)K. Pronounced anomalies in the field-dependent chi_ac(H) data as well as in the corresponding imaginary part chi"_ac(H) reveal a precursor region around T_C in the magnetic phase diagram. The occurrence of a maximum at T_0=279.6K in the zero-field specific heat data indicates a second order transition into a magnetically ordered state. A shoulder evolves above this maximum as a magnetic field is applied. The field dependence of both features coincides with crossover lines from the field-polarized to the paramagnetic state deduced from chi_ac(T) at constant magnetic fields. The experimental findings are analyzed within the standard Dzyaloshinskii theory for cubic helimagnets. The remarkable multiplicity of modulated precursor states and the complexity of the magnetic phase diagram near the magnetic ordering are explained by the change of the character of solitonic inter-core interactions and the onset of specific confined chiral modulations in this area.

16 pages, 7 figures

References in corpus (10)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Precursor phenomena at the magnetic ordering of the cubic helimagnet FeGe
• Stabilization of Skyrmion textures by uniaxial distortions in noncentrosymmetric cubic helimagnets
• Chiral Skyrmionic matter in non-centrosymmetric magnets
• Chiral criticality in doped Mn${}_{1-y}$Fe${}_y$Si compounds
• Ultrasonic studies of the magnetic phase transition in MnSi
• Magnetic Fluctuations and Correlations in MnSi - Evidence for a Skyrmion Spin Liquid Phase
• Structural investigations on $\epsilon$-FeGe at high pressure and low temperature
• Confinement of Skyrmion states in noncentrosymmetric magnets
• A-phase origin in B20 helimagnets

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