Solid state single crystal growth of three-dimensional faceted LaOFeAs crystals

11:00 - 12:00
Dr. Sabine Wurmehl
IFW Dresden / IFF
Grit Rötzer
Soon after the discovery of iron-based superconductors, single crystals of various pnictide families were successfully grown using self-flux growth. However, LaOFeAs single crystals are hard to be obtained via flux growth [1]-[2]. Crystals could be successfully synthesized using high-pressure-high- temperature synthesis [3], but this method is limited to rather small crystals and also did not lead to a reasonable growth along the c direction, so far. This lack of large, well-faceted and 3-dimensional crystals is currently hindering their detailed investigation.

Solid state single crystal growth (SSCG) is a crystal growth technique where crystals are grown from a polycrystalline matrix. Here, we present single crystals of the iron pnictide LaOFeAs grown via SSCG. The size of the as-grown crystals are up to 2x3x0.4 mm3. Typical for this method, but very uncommon for crystals of the pnictide superconductors and especially for the oxypnictides, the crystals show pronounced facets and considerable growth in c direction [4]. Current research aims to further understand details of the growth mechanism and to explore growth of crystals with different types of doping using the SSCG method. These crystals are subject of several studies to shed light on the physics of their properties (see, e.g., [5]).

1. J.-Q. Yan, et al., Appl. Phys. Lett. 95, 222504 (2009).
2. A. Jesche, et al. Phys. Rev. B 86, 134511 (2012).
3. N. D. Zhigadlo, et al., Phys. Rev. B 86, 214509 (2012).
4. R. Kappenberger, et al., J. Cryst. Growth 483, 9 (2018).
5. L. Wang, et al., J. Magn. Magn Mater. 482, 50 (2019).

This work has been supported by Deutsche Forschungsgemeinschaft DFG. The authors thank R. Wachtel, D. Meiler, J. Werner, L. Giebeler, S. Müller-Litvanyi, C. Wuttke and S. Gass (all IFW Dresden) for support and J. M. Ok (POSTECH) for valuable discussions.

Letztmalig verändert: 27.05.2020, 00:05:32


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Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
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