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

AuthorsLaliena, Victor; Campo, Javier ; Kousaka, Yusuke
Issue Date2017
PublisherAmerican Physical Society
CitationPhysical Review B 95(22): 224410 (2017)
AbstractThe 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 DeGennes 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 a 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.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.95.224410
Appears in Collections:(ICMA) Artículos
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