Structural, thermal, and electronic properties of Fe2VSi1xAlx

C. S. Lue, Y.-K Kuo, S.-N. Horng, S. Y. Peng, and C. Cheng
Phys. Rev. B 71, 064202 – Published 23 February 2005

Abstract

In order to access the influence of the local environment on the structural and electronic properties of Fe2VSi, we investigated the Fe2VSi1xAlx series of compounds by measuring electrical resistivity (ρ), thermal conductivity (κ), Seebeck coefficient (S), as well as heat capacity (Cp) as a function of temperature. For Fe2VSi, all obtained quantities exhibit anomalous features near the structural transition temperature Ts123K. For the nonstoichiometric compounds Fe2VSi1xAlx, these anomalies remain evident but appear to be weaker as increasing Al concentration. The corresponding transition temperature Ts decreases with x, indicating the suppression of the low-temperature tetragonal phase via Al doping in Fe2VSi. 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 xC0.25. In addition, several aspects regarding the structural and electronic properties were compared to those of other Heusler alloys.

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  • Received 6 September 2004

DOI:https://doi.org/10.1103/PhysRevB.71.064202

©2005 American Physical Society

Authors & Affiliations

C. S. Lue1, Y.-K Kuo2,*, S.-N. Horng1, S. Y. Peng2, and C. Cheng1

  • 1Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
  • 2Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan

  • *Electronic address: ykkuo@mail.ndhu.edu.tw

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Vol. 71, Iss. 6 — 1 February 2005

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