Transport properties of the ferromagnetic Heusler alloy Co2TiSn

Majumdar, S. ; Chattopadhyay, M. K. ; Sharma, V. K. ; Sokhey, K. J. S. ; Roy, S. B. ; Chaddah, P. (2005) Transport properties of the ferromagnetic Heusler alloy Co2TiSn Physical Review B: Condensed Matter and Materials Physics, 72 (1). 012417_1-012417_4. ISSN 1098-0121

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We report the results of magnetization, zero-field resistivity, and magnetoresistance measurements in the ferromagnetic Heusler alloy Co2TiSn. 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. This changes abruptly to metallic behavior at the onset of ferromagnetic ordering. Application of external magnetic field tends to suppress this semiconducting-like transport leading to a negative magnetoresistance that reaches a peak in the vicinity of the Curie temperature. Comparison is made with the similar unusual behavior observed in other systems, including UNiSn and manganites.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:84475
Deposited On:25 Feb 2012 13:56
Last Modified:25 Feb 2012 13:56

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