Determining Curie temperatures in dilute ferromagnetic semiconductors: high Curie temperature (Ga,Mn)As

Wang, M.; Marshall, R.A.; Edmonds, K.W.; Rushforth, A.W.; Campion, R.P.; Gallagher, B.L.

Abstract

In this paper, we use simultaneous magnetometry and electrical transport measurements to critically examine ways in which the Curie temperature (TC) values have been determined in studies of dilute magnetic semiconductors. We show that, in sufficiently homogeneous samples, TC can be accurately determined from remanent magnetization and magnetic susceptibility and from the positions of the peak in the temperature derivative of the resistivity. We also show that the peak of the resistivity does not occur at TC, as illustrated by a (Ga,Mn)As sample for which the peak of the resistivity is at 21361K when TC is only 17861K

Citation

Wang, M., Marshall, R., Edmonds, K., Rushforth, A., Campion, R., & Gallagher, B. (2014). Determining Curie temperatures in dilute ferromagnetic semiconductors: high Curie temperature (Ga,Mn)As. Applied Physics Letters, 104, Article 132406. https://doi.org/10.1063/1.4870521

• Journal Article Type: Article
• Acceptance Date: Mar 25, 2014
• Publication Date: Apr 3, 2014
• Deposit Date: Jun 23, 2016
• Publicly Available Date: Jun 23, 2016
• Journal: Applied Physics Letters
• Print ISSN: 0003-6951
• Electronic ISSN: 1077-3118
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 104
• Article Number: 132406
• DOI: https://doi.org/10.1063/1.4870521
• Public URL: https://nottingham-repository.worktribe.com/output/727735
• Publisher URL: http://scitation.aip.org/content/aip/journal/apl/104/13/10.1063/1.4870521
• Additional Information: Determining Curie temperatures in dilute ferromagnetic semiconductors: high Curie temperature (Ga,Mn)As,; M. Wang, R.A. Marshall, K.W. Edmonds, A.W. Rushforth, R.P. Campion, and B.L. Gallagher. Applied Physics Letters 104, 132406 (2014); doi:10.1063/1.4870521.
• Contract Date: Jun 23, 2016