Coexistence of Ferromagnetism and Superconductivity in Rapidly Quenched Ni2NbSn Heusler Alloy.

We present the study on production and structural, electric and magnetic properties of superconductive Ni2NbSn Heusler alloy. The sample has been produced by melt-spinning method using tangential speed of copper wheel 20 m/s. Polycrystalline structure has been obtained showing single phase with B2 disorder with lattice constant a = 6:1654 Å. Resistance measurement shows superconductive behavior with critical temperature close to 5 K. Magnetic measurements also exhibit diamagnetic contribution from superconductive phase. Additionally, the ferromagnetic state has been observed below 20 K, which points to the coexistence of magnetic and superconducting state. [ABSTRACT FROM AUTHOR]