doi:10.1103/PhysRevB.95.224410engLaliena, V.Campo, J.Kousaka, Y.Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fieldsART-2017-101049The 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.2017http://zaguan.unizar.es/record/6201410.1103/PhysRevB.95.224410http://zaguan.unizar.es/record/62014oai:zaguan.unizar.es:62014info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-2-PPhysical Review B 95 (2017), 224410 [9 pp]by-nchttp://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccess