Structural and magnetic phase transitions in MnTe-MnSe solid solutions

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:347

Article

Ingle, Kapil E.¹  D'Sa, B. C. Efrem¹  Das, A.²  Priolkar, K. R.¹ 

[1] Goa Univ, Dept Phys, Panaji 403206, Goa, India

[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

关键词: MnTe;    MnSe;    Neutron diffraction;    Magnetic semiconductor;   

DOI  :  10.1016/j.jmmm.2013.07.052

来源: Elsevier

【 摘 要 】

Neutron diffraction studies as a function of temperature on solid solutions of MnSe and MnTe in the Se rich region are presented. Interestingly as Te is doped in MnSe, the structural transformation to NiAs phase diminishes, both in terms of % fraction of compound as well as in terms of transition temperature. In MnTe0.3Se0.7, the NaCl to NiAs phase transformation occurs at about 40 K and although it is present at room temperature in MnTe0.5Se0.5, its volume fraction is only about 10% of the total volume of sample. The magnetic ordering temperature of the cubic phase decreases with increasing Te content while the hexagonal phase orders at the same temperature as in MnSe. Anomalies in thermal evolution of lattice parameters at magnetic ordering as well as structural transition temperatures indicate the presence of magnetostructural coupling in these compounds. (c) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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