Pre-martensitic phenomena in a near stoichiometric Ni_2MnGa Polycrystalline alloy

Issue title: E-MRS Fall Meeting 2005

Article type: Research Article

Authors: Sánchez-Alarcos, V.^a | Pérez-Landazábal, J.I.^{a; *} | Recarte, V.^a | Gómez-Polo, C.^a | Chernenko, V.A.^b

Affiliations: [a] Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía 31006 Pamplona, Spain | [b] Institute of Magnetism, National Academy of Ukraine, Vernadsky Street 36B, 03142 Kiev, Ukraine

Correspondence: [*] Corresponding author: J.I. Pérez-Landazábal, Departamento de Física, Universidad Pública de Navarra, Campus de Arrosadía, 31006-Pamplona, Spain. Tel.: +34 948 168448; Fax: +34 948 169565; E-mail: [email protected]

Abstract: The internal friction, the elastic modulus and the AC magnetic susceptibility of a near stoichiometric Ni2MnGa polycrystalline sample with low transition temperatures have been measured as a function of temperature by resonant ultrasound spectroscopy (RUS) and superconducting quantum interference device (SQUID) measurements. An internal friction peak and two minima in the elastic modulus have been observed, corresponding to the weakly first order transition from the cubic L2_{1} parent phase to the intermediate phase (at T_{I}≅ 213 K) and to the Martensitic Transformation (at T_{M}≅ 100 K). The real part of the magnetic susceptibility shows a decrease and the imaginary part a peak at T_{I}.

Keywords: Ni[TeX:] _{2}MnGa alloy, Pre-martensitic phenomena, Resonant ultrasound spectroscopy, Magnetic susceptibility

DOI: 10.3233/JAE-2006-731

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 23, no. 1-2, pp. 93-98, 2006