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We report a study of structural, magnetic, heat capacity and thermoelectricproperties of a Rubased Heusler alloy, Ru2TiGe. The magnetic measurementsreveal that at higher temperatures, diamagnetic and Pauli paramagneticcontributions dominate the magnetic behaviour whereas, at lower temperatures(T<= 20 K), superparamagnetic interaction among clusters is observed. Effect ofsuch magnetic defects is also evident in the electrical resistivity behaviourat lower temperatures. Though the temperature dependence of resistivityexhibits a metal-like nature, the large value of Seebeck coefficient leads toan appreciable power factor of the order of 1 mW/mK2 at 300 K. Large powerfactor as well as low thermal conductivity results in a value of ZT = 0.025 at390 K for Ru2TiGe that is orders of magnitude higher than that of the otherpure Heusler alloys and point towards its high potential for practicalthermoelectric applications.

Superparamagnetic and metal-like Ru2TiGe: a propitious thermoelectric material