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The phase diagram of the monoaxial chiral helimagnet as a function oftemperature (T ) and magnetic field with components perpendicular (H x ) andparallel (H z ) to the chiral axis is theoretically studied via the variationalmean field approach in the continuum limit. A phase transition surface in thethree dimensional thermodynamic space separates a chiral spatially modulatedphase from a homogeneous forced ferromagnetic phase. The phase boundary isdivided into three parts: two surfaces of second order transitions ofinstability and nucleation type, in De Gennes terminology, are separated by asurface of first order transitions. Two lines of tricritical points separatethe first order surface from the second order surfaces. The divergence of theperiod of the modulated state on the nucleation transition surface has thelogarithmic behavior typical of a chiral soliton lattice. The specific heatdiverges on the nucleation surface as a power law with logarithmic corrections,while it shows a finite discontinuity on the other two surfaces. The solitondensity curves are described by a universal function of H x if the values of Tand H z determine a transition point lying on the nucleation surface;otherwise, they are not universal.

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