Тепловые, магнитные и магнитотранспортные свойства быстрозакаленнго ленточного образца Ni-=SUB=-50-=/SUB=-Mn-=SUB=-35-=/SUB=-Al-=SUB=-2-=/SUB=-Sn-=SUB=-13-=/SUB=-

Abstract

The heat capacity, thermal diffusivity, thermal conductivity, magnetization, and electrical resistance in a tape sample of Ni50Mn35Al2Sn13 alloy were studied. The temperature dependence of thermal diffusion shows pronounced anomalies in the form of minima associated with magnetic and magnetostructural transformations. The behavior of thermal conductivity and thermal diffusion indicates that the mean free path of heat carriers is limited by the structural imperfections of the tape. The transition of the sample to the martensitic phase is accompanied by a sharp increase in the electrical resistance, suggesting an increase in the electron relaxation rate due to structural distortions inherent in martensite. The magnitude of the magnetoresistive effect ∆ρ/ρ_0 in the field of 1.8T near the martensitic transition is reached 40%. The temperature hysteresis was revealed in the dependence ρ(T) near TC, which indicates the structural heterogeneity of the austenitic phase.