Systematic study of structural, transport, and magnetic properties of Ni52+xMn26-xAl22 (1 ≤ x ≤ 5) melt-spun ribbons

Saurabh Kumar Srivastava, Vijay Kumar Srivastava, Lajos K. Varga, Vladimir V. Khovaylo, Ryousuke Kainuma, Makoto Nagasako, Ratnamala Chatterjee

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Structural, magnetic, and transport properties of Ni52+xMn 26-xAl22 (1 ≤ x ≤ 5) melt-spun ribbons have been characterized by a variety of experimental techniques. As the composition changed from x = 1 to x = 5, the martensitic transition temperature T 0 [ = (Ms + Af)/2] was found to increase from 277 K to 446 K which was attributed to an increase in the valence electron concentration e/a. In the martensitic state, all the samples demonstrate an anomalous semiconducting behavior of electrical resistivity ρ. This uncommon feature of the transport properties has been ascribed to the existence of a gap (Eg ∼ 0.1 eV) at the Fermi level. A crossover from semiconducting to metallic behavior of ρ observed in the martensitic state of Ni57Mn21Al22 is presumably related to a spin-density wave formation at the Neel temperature TN ≈ 300 K. Analysis of a low-temperature (T < 60 K) part of the resistivity curves and comprehensive magnetic measurements of a Ni57Mn21Al 22 (x ≤ 5) sample provide grounds for the conclusion that the splitting of zero-field cooling and field cooling magnetization curves observed at low temperatures is due to a spin-glass state that is formed below the freezing temperature Tf.

Original languageEnglish
Article number083915
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 2011 Apr 15


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