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    Investigation of magnetic and electrical properties in the Mo-substituted Ni-Mn-Sb Heusler alloys
    (Springer, 2023) Ayyildiz, Murat; Kirat, Gokhan; Aksan, Mehmet Ali
    In this study, Heusler alloys with nominal composition of Ni50-xMoxMn37Sb13+B2 (x = 0, 1, 3, 5, and 7) were synthesized by the arc-melting method. In the samples with low Mo-content, 4O and 10 M phases were obtained, indicating the presence of the martensite phase, while in the samples with high Mo-content, the L21 phase was determined, which is attributed to the austenite structure. The samples showed a two-step transition between T1 and T2 temperatures in the temperature dependent magnetization measurements, which is attributed to a premartensitic transformation. It was observed that the interval T1-T2 decreased with the increase of Mo-content in the system. It was found that there was an increase in magnetization value due to Curie transition around 350 K in x = 0 and x = 1 Mo-substituted samples, but there was no such increase between 5 and 360 K for other samples. It was found that the blocking temperature (TB) was affected by the Mo-substitution. The thermal hysteresis between the M-T curves during cooling and heating indicates a first-order phase transition in the samples. It is evident from both the M-T and rho-T analyses that the MT temperatures shifted to low temperatures as the Mo-content increases. An exchange bias effect was observed in the samples. increment SM with a positive sign was determined for all samples, reaching a maximum value around MT temperature. The maximum increment SM was obtained at a magnetic field of 5 T at 255 K in the x = 3 Mo-substituted sample. Similarly, the highest RC, AHL and RCeff values were also found for the x = 3 Mo-substituted sample.