Magnetostructural instability in the ferromagnetic shape memory alloy of composition Ni 2 Mn 1.4 Sn 0.6 is investigated by transport and magnetic measurements. Large negative magnetoresistance is observed around the martensitic transition temperature ͑90-210 K͒. Both magnetization and magnetoresistance data indicate that upon the application of an external magnetic field at a constant temperature, the sample attains a fieldinduced arrested state which persists even when the field is withdrawn. We observe an intriguing behavior of the arrested state that it can remember the last highest field it has experienced. The field-induced structural transition plays the key role for the observed anomaly and the observed irreversibility can be accounted for by the Landau-type free energy model for the first-order phase transition.
We present here a detailed investigation of the magnetic and structural
behaviours of a ferromagnetic shape memory alloy with nominal composition
Ni2Mn1.44Sb0.6. The alloy undergoes a structural transition from a high-temperature cubic phase
() to an orthorhombic low-temperature phase below approximately 200 K. We
observe a clear signature of this martensitic transformation in resistivity, magnetic
susceptibility, heat capacity and x-ray diffraction data. The first-order nature of the
transition is clear from the thermal irreversibility present in the temperature
dependence of various physical properties. A wide region of phase coexistence
across the martensitic transformation, arising from the influence of disorder on the
first-order phase transition, is observed. A small but positive entropy change due
to an applied magnetic field occurs across the region of phase coexistence. An
interplay between the structural and magnetic behaviour is evident from our
study.
Excited states of the 64 Cu (Z = 29, N = 35) nucleus have been probed using heavy-ion induced fusion evaporation reaction and an array of Compton suppressed Clovers as detection system for the emitted γ rays. More than 50 new transitions have been identified and the level scheme of the nucleus has been established upto an excitation energy Ex ∼ 6 MeV and spin ∼ 10. The experimental results have been compared with those from large basis shell model calculations that facilitated an understanding of the single particle configurations underlying the level structure of the nucleus.
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