Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.7: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Crystal Growth and Characterization of CeFe1−xRux PO — •Tanita Ballé, Kristin Kliemt, and Cornelius Krellner — Goethe Universität Frankfurt, Kristall- und Materiallabor
CeRuPO is a one of the few heavy fermion systems, which order ferromagnetically at low temperatures (TC = 15 K), because of dominant RKKY-interaction [1]. CeFePO on the other hand shows no long-range magnetic order even at low temperatures because of dominant Kondo effect [2] (TK = 10 K). By substituting CeFePO with ruthenium we can reach a quantum critical point, at which the RKKY-interaction and the Kondo effect are equally strong [3]. To study the quantum critical point, and to enlighten the question if the order stays ferromagnetically down to lowest temperatures, high quality crystals are needed. Here, the growth and characterization of the single crystals will be discussed. We obtained mm-sized single crystals of the unsubstituted CeRuPO and CeFePO by a modified Bridgeman method using tin as a flux. The quality of the crystals was verified by Powder-X-Ray-Diffraction, energy dispersive X-ray spectroscopy and Laue backscattering.
[1] C. Krellner et al., PRB 76, 104418 (2007)
[2] E. M. Brüning et al., PRL 101, 117206 (2008)
S. Lausberg et al., PRL 109, 216402 (2012)
[3] S. Kitagawa et al., J. Phys. Soc. Jpn. 82, 033704 (2013)