Preparation And Physical Properties Investigation Of Some Noncentrosymmetric Superconductors And Magnetic Materials

Symmetry breaking is linked to phase transition closely,and it makes novel phys-ical phenomenon emergent.For instance,in a noncentrosymmetric superconductor,there are a mixing state of spin-singlet and spin-triplet for Cooper pairs,and a point node or line node in its gap structure.These have been observed experimentally on CePt₃Si and Li₂Pt₃B.What is more,inversion symmetry breaking could induce Dzyaloshinskii-Moriya interaction in noncentrosymmetric magnetic materials,resulting in sophisti-cated non-colinear magnetic structure such as helical,conical,skyrmionic states in ma-terials.These have been observed experimentally on MnSi,FeGe and other noncen-trosymmetric materials.Nevertheless,there are not enough noncentrosymmetric superconductors and non-centrosymmetric skyrmionic materials up to now.This fact prevents people from taking deep studying on them.Based on above discussion,the main work of this manuscript are listed below:?1?We succeeded synthesizing material Rh₂Mo₃N with ?-Mn structure.After taking resistive,magnetic,specific heat and Andreev reflection spectroscopy measure-ments on it,we find that its superconducting phenomenon appears at Tc = 4.3 K,af-ter which we find that Rh₂Mo₃N is a BCS type superconductor,with an s-wave spin-singlet state dominated on it.In this case,we propose that the main reason for the spin-singlet state being dominant is that the strength of anti-symmetric spin-orbit coupling in Rh₂Mo₃N is too weak.?2?We succeeded preparing Mo_0.63Ru_0.37.It is reinvestigated by resistive,mag-netic,and specific heat measurements.By analysing the experimental data,we finally conclude that Mo_0.63Ru_0.37 is an s-wave BCS type superconductor.?3?Some novel magnetic materials are also synthesized and investigated,including Mn_1.4Pd_0.9Pt_0.1Sn,Co₈Zn₁₀Fe₂,Co-Zn-Mn alloys,FeGe.In Mn_1.4Pd_0.9Pt_0.1Sn,we find that more than one ordered magnetic phases exist,and a novel micromagnetic structure is observed when using the Lorentz transmission electron microscopy.In Co₈Zn₁₀Fe₂,a magnetic field induced quaint behaviour is observed near Curie temperature of Tc=467 K.In Co-Zn-Mn,we observe anomaly around its Curie temperature.And in FeGe,skyrmionic phase is observed,too.