期刊
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
卷 369, 期 1951, 页码 3588-3601出版社
ROYAL SOC
DOI: 10.1098/rsta.2011.0183
关键词
half-metallic ferromagnets; electronic structure; Heusler compounds; thermoelectric properties
资金
- Stiftung Innovation Rheinland-Pfalz
- Deutsche Forschungsgemeinschaft DFG [P 01, P 07, FG 559, FOR 559]
- DAAD [D06/33952]
- BMBF [ES3XBA/5]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
In this work, the theoretical and experimental investigations of Co(2)TiZ (Z = Si, Ge or Sn) compounds are reported. Half-metallic ferromagnetism is predicted for all three compounds with only two bands crossing the Fermi energy in the majority channel. The magnetic moments fulfil the Slater-Pauling rule and the Curie temperatures are well above room temperature. All compounds show a metallic-like resistivity for low temperatures up to their Curie temperature, above the resistivity changes to semiconducting-like behaviour. A large negative magnetoresistance (MR) of 55 per cent is observed for Co2TiSn at room temperature in an applied magnetic field of mu H-0 = 4T, which is comparable to the large negative MRs of the manganites. The Seebeck coefficients are negative for all three compounds and reach their maximum values at their respective Curie temperatures and stay almost constant up to 950 K. The highest value achieved is -52 mu VK-1 for Co2TiSn, which is large for a metal. The combination of half-metallicity and the constant large Seebeck coefficient over a wide temperature range makes these compounds interesting materials for thermoelectric applications and further spincaloric investigations.
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