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In this work the theoretical and experimental investigations of Co2TiZ (Z =Si, Ge, or Sn) compounds are reported. Half-metallic ferromagnetism ispredicted for all three compounds with only two bands crossing the Fermi energyin the majority channel. The magnetic moments fulfill the Slater-Pauling ruleand the Curie temperatures are well above room temperature. All compounds showa metallic like resistivity for low temperatures up to their Curie temperature,above the resistivity changes to semiconducting like behavior. A large negativemagnetoresistance of 55% is observed for Co2TiSn at room temperature in anapplied magnetic field of 4T which is comparable to the large negativemagnetoresistances of the manganites. The Seebeck coefficients are negative forall three compounds and reach their maximum values at their respective Curietemperatures and stay almost constant up to 950 K. The highest value achievedis -52muV/K m for Co2TiSn which is large for a metal. The combination ofhalf-metallicity and the constant large Seebeck coefficient over a widetemperature range makes these compounds interesting materials forthermoelectric applications and further spincaloric investigations.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

Anomalous transport properties of the halfmetallic ferromagnets Co2TiSi, Co2TiGe, and Co2TiSn