In order to access the influence of the local environment on the structural and electronic properties of Fe 2VSi, we investigated the Fe 2VSi 1-xAl x series of compounds by measuring electrical resistivity (ρ), thermal conductivity (κ), Seebeck coefficient (S), as well as heat capacity (C p) as a function of temperature. For Fe 2VSi, all obtained quantities exhibit anomalous features near the structural transition temperature T s ≈ 123 K. For the nonstoichiometric compounds Fe 2VSi 1-xAl x, these anomalies remain evident but appear to be weaker as increasing A1 concentration. The corresponding transition temperature T s decreases with x, indicating the suppression of the low-temperature tetragonal phase via A1 doping in Fe 2VSi. Theoretical studies with ab initio calculations were also employed to investigate the present structural and magnetic phase transition. Both theoretical results and experimental observations consistently yield a possible disappearance of the structural transition beyond a critical concentration x c≈0.25. In addition, several aspects regarding the structural and electronic properties were compared to those of other Heusler alloys.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2005 Feb 1|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics