doi:10.1103/PhysRevB.98.144445engLaliena, V.Kato, Y.Albalate, G.Campo, J.Thermal fluctuations in the conical state of monoaxial helimagnetsART-2018-108927The effect of thermal fluctuations on the phase structure of monoaxial helimagnets with external magnetic field parallel to the chiral axis is analyzed by means of a saddle point expansion of the free energy. The phase transition that separates the conical and forced ferromagnetic phases is changed to first order by the thermal fluctuations. In a purely monoaxial system the pitch of the conical state remains independent of temperature and magnetic field, as in mean-field theory, even when fluctuations are taken into account. However, in the presence of weak Dzyaloshinskii-Moriya interactions in the plane perpendicular to the chiral axis, thermal fluctuations induce a dependence of the pitch on temperature and magnetic field. This may serve to determine the nature of magnetic interactions in such systems.2018http://zaguan.unizar.es/record/7601410.1103/PhysRevB.98.144445http://zaguan.unizar.es/record/76014oai:zaguan.unizar.es:76014info:eu-repo/grantAgreement/ES/MINECO/MAT2015-68200-C2-2-PPhysical Review B 98, 14 (2018), 144445 [10 pp]by-nchttp://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccess