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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 10: Magnetic Heuslers, Half-Metals and Oxides I (organized by MA)

TT 10.3: Talk

Monday, March 31, 2014, 10:00–10:15, BEY 118

Neutron diffraction study of Ni45Co5Mn38Sb12 Heusler system — •Roshnee Sahoo1, Amitabh Das2, KG Suresh1, Daniel Ebke3, and Claudia Felser31Department of Physics, Indian Institute of Technology Bombay, Mumbai-400076, India — 2Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai- 400085, India — 3Max Planck Institute of Chemical Physics of Solids, Dresden-01187, Germany

Considerably large martensitic transition temperature has been observed after substituting Co for Ni site in Ni45Co5Mn38Sb12 system. This system exhibits austenite L21 cubic structure with a=5.96 Å at high temperatures, while it has orthorhombic structure in the martensitic phase. We have carried out a detailed neutron diffraction study in order to establish the magnetic structure and the nature of magnetic coupling in this system. In Ni45Co5Mn38Sb12 system, from temperature variation of neutron diffraction data has shown that with increase in temperature the moments of 2a and 2f site decrease up to 250 K and after that both decrease. At 300 K, the material is in the austenite phase, which gives a moment of 1.1µB at 4a site and 0.8µB at 4b site. The fact that the spontaneous magnetization of 2µB is obtained from magnetization measurement suggests that the Mn moment at 4a and 4b sites are coupled ferromagnetically in austenite phase. It is also noticed that with increase in temperature the cell volume increases. However, near the martensitic transition there is a decrease of 0.3% of cell volume. Detailed structural and magnetic results, as obtained from the neutron data, will be discussed in the full paper.

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