Physics – Condensed Matter – Materials Science
Scientific paper
2005-06-06
Physics
Condensed Matter
Materials Science
9 pages of text including 5 figures. Submitted to Physical Review B
Scientific paper
10.1103/PhysRevB.72.012417
We report results of magnetization, zero field resistivity and magnetoresistance measurements in ferromagnetic Heusler alloy Co$_2$TiSn. There is a striking change in the character of electron transport as the system undergoes the paramagnetic to ferromagnetic transition. In the paramagnetic state the nature of the electron transport is like that of a semiconductor and this changes abruptly to metallic behaviour at the onset of ferromagnetic ordering. Application of external magnetic field tends to suppress this semiconducting like transport leading to a negative magnetoresistance which reaches a peak in the vicinity of Curie temperature. Comparison is made with the similar unusual behaviour observed in other systems including UNiSn and manganites.
Chaddah Praveen
Chattopadhyay M. K.
Majumdar Satya
Roy S. B.
Sharma Virender K.
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