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MA: Fachverband Magnetismus

MA 27: Half-metals and Oxides (jointly with TT)

MA 27.7: Vortrag

Mittwoch, 28. März 2012, 11:15–11:30, EB 202

Magnetic and Electrical Properties of the possibly Antiferromagnetic Half-metal Double Perovskite La₂CrWO₆ — •Mehran Vafaee Khanjani, Philipp Komissinskiy, Mehrdad Baghaie Yazdi, Anastasiya Kolchynska, and Lambert Alff — Institute for Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany

The combination of a magnetic ion (B-site) and a non-magnetic ion (B’-site) in double perovskites (A₂BB’O₆) can lead to an induced magnetic moment at the non-magnetic site [1-3]. Therefore, double perovskites are hot candidates in the search for compensated antiferromagnetic half-metals (AFM-HMs) which are considered to be useful for spintronics, supplying on the one hand, fully spin-polarized electrons, and on the other hand due to the antiferromagnetic configuration, they are magnetically stable. Following band structure calculations [4] and a simple ionic picture, La₂CrWO₆ is an AFM-HM candidate. However, as bulk material this compound is thermodynamically unstable. One way of synthesizing such a material is a thin film approach forcing W into a very unusual W³⁺ state. To our knowledge, we have synthesized for the first time La₂CrWO₆ by pulsed laser deposition. Crystal structure, magnetic and electrical properties are presented. The Authors would like to thank the DFG GK 1035.

[1] K. L. Kobayashi et al, Nature 395, 677 (1998). [2] Y. Krockenberger et al, Phys. Rev. B 75, 020404(R) (2007). [3] A. Winkler et al, New J. Phys. 11, 073047 (2009). [4] V. Pardo et al, Phys Rev B 80, 054415 (2009).