62014 20180723113746.0 doi 10.1103/PhysRevB.95.224410 sideral 101049 ART-2017-101049 eng (orcid)0000-0002-8173-1846 Laliena, V. Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields 2017 Access copy available to the general public Unrestricted The 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. info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-2-P info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 3.813 2017 PHYSICS, CONDENSED MATTER 18 / 67 = 0.269 2017 Q2 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0002-3600-1721 Campo, J. Universidad de Zaragoza Kousaka, Y. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 95 (2017), 224410 [9 pp] Phys. Rev. B Physical Review B 2469-9950 1169319 http://zaguan.unizar.es/record/62014/files/texto_completo.pdf Versión publicada 132093 http://zaguan.unizar.es/record/62014/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:62014 articulos driver 2018-07-23-11:30:05 ARTICLE