TY - JOUR
T1 - Systematic study of structural, transport, and magnetic properties of Ni52+xMn26-xAl22 (1 ≤ x ≤ 5) melt-spun ribbons
AU - Srivastava, Saurabh Kumar
AU - Srivastava, Vijay Kumar
AU - Varga, Lajos K.
AU - Khovaylo, Vladimir V.
AU - Kainuma, Ryousuke
AU - Nagasako, Makoto
AU - Chatterjee, Ratnamala
N1 - Funding Information:
This work was supported by RUSP-826 DST-RFBR Project and by the Creation and Development Program of NUST “MISiS.” The DST National SQUID facility at IIT(D), India, is also acknowledged. S.K.S. would like to acknowledge CSIR, India, for providing a fellowship. V.V.K. greatly acknowledges JSPS for the Invitation Fellowship for Research in Japan.
PY - 2011/4/15
Y1 - 2011/4/15
N2 - 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.
AB - 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.
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U2 - 10.1063/1.3567942
DO - 10.1063/1.3567942
M3 - Article
AN - SCOPUS:79955721416
VL - 109
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 8
M1 - 083915
ER -