Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.90: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Zero Field 55Mn NMR study of Ni-Mn-Sn Heusler alloys — •Maria Eleni Belesi1, Ahmad Omar1, Sabyasachi Pramanick2, Subham Majumdar2, Bernd Büchner1,3, and Sabine Wurmehl1,3 — 1Leibniz Institute for Solid State and Materials Research, Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany — 2Department of Solid State Physics, Indian Association for the Cultivation of Science, 2A and B Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, India — 3Institute for Solid State Physics, TU Dresden, D-01069, Germany
We present a nuclear magnetic resonance (NMR) study of the Heusler alloys Ni2Mn1+xSnx, which are known to exhibit shape memory effects, exchange bias, inverse magnetocaloric and giant magnetoresistance in certain stoichiometry regimes. The x=0 member of the family, Ni2MnSn, is a ferromagnetic Heusler alloy with a Curie temperature of TC=349 K and cubic L21 structure. For 0.35<x<0.47 these compounds manifest a structural transition to the so-called martensitic phase, which has lower crystal symmetry than the parent cubic state and is dominated by a complex strained structure. To probe this structure as well as the accompanied modification of the local magnetic properties through the martensitic transition, we perform zero-field 55Mn NMR experiments on Ni2Mn1+xSnx samples prepared by arc melting. These experiments provide local information for the evolution of the structural and magnetic properties with stoichiometry and as we vary the temperature through the martensitic transition.