Berlin 2012 – scientific programme
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KR: Fachgruppe Kristallographie
KR 5: Poster I – including Multiferroics (MA with DF, DS, KR, TT)
KR 5.47: Poster
Tuesday, March 27, 2012, 12:15–15:15, Poster A
Growth, Annealing and Characterization of Sr3Fe2O7−δ — •Darren Peets1, Junghwa Kim1, Andrey Maljuk1,2, Chengtian Lin1, and Bernhard Keimer1 — 1MPI-FKF, Heisenbergstr. 1, D-70569 Stuttgart — 2IFW Dresden, Helmholtzstr. 20, D-01069 Dresden
Iron(IV)- and ruthenium(IV)-containing perovskite-related phases have proven rich in novel physics. SrFeO3−x exhibits a wide variety of unusual magnetic phases, from five distinct types of helical magnetism at x=0 [1] to a phase with frustrated, disordered Fe4+ moments at x=0.25 [2]. The Ru-based intergrowth phase Sr3Ru2O7 exhibits metamagnetic quantum critical points in field. However, the magnetic phase diagram of its Fe4+ analogue Sr3Fe2O7−δ remains largely unexplored. We report the crystal growth, oxygen annealing, and characterization of large single-crystalline samples of Sr3Fe2O7−δ suitable for neutron diffraction experiments. This work lays the foundation for comprehensive doping-dependent studies of Sr3Fe2O7−δ’s magnetic phase diagram and magnetic excitations.
[1] S. Ishiwata et al., Phys. Rev. B 84, 054427 (2011)
[2] M. Schmidt et al., J. Phys.: Condens. Matter 15, 8691 (2003)
[3] R.A. Borzi et al., Science 315, 214 (2007)