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Confinement of chiral magnetic modulations in the precursor region of FeGe

DOI: 10.1088/0953-8984/24/29/294204 DOI Help
PMID: 22773363 PMID Help

Authors: M. Baenitz (Max Planck Institute for Chemical Physics of Solids, Germany) , M. Schmidt (Max Planck Institute for Chemical Physics of Solids, Germany) , C. Naylor (The Hong Kong University of Science and Technology, Hong Kong) , R. Lortz (The Hong Kong University of Science and Technology, Hong Kong) , U. K. Roessler (IFW Dresden, Germany) , A. A. Leonov (IFW Dresden, Germany) , A. N. Bogdanov (IFW Dresden, Germany) , H. Wilhelm (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Physics-condensed Matter , VOL 24 (29)

State: Published (Approved)
Published: July 2012

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 = 279.6 K 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.

Keywords: Chirality; Cubic Lattices; Germanium Compounds; Interactions; Iron Compounds; Magnetic Fields; Magnetic Susceptibility; Magnetization; Modulation; Multiplicity; Paramagnetism; Phase Diagrams; Specific Heat; Temperature Range 0273-0400 K

Subject Areas: Physics


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Confinement of chiral magnetic modulations in the precursor region of FeGe.pdf