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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: f-Electron Systems and Heavy Fermions 1

TT 34.6: Vortrag

Mittwoch, 18. März 2020, 10:45–11:00, HSZ 204

CeRu₂P₂ and CeCo₂P₂: Single Crystal Growth Method and Magnetic Properties — •Fabian Feldmann, Marius Peters, Johannes Hellwig, Kristin Kliemt, and Cornelius Krellner — Physikalisches Institut Goethe Universität Frankfurt/Main

CeT₂P₂ (T = Co, Ru) are rare-earth ternary phosphides with tetragonal ThCr₂Si₂ -type crystal structure. CeRu₂P₂ is an intermediate valent system [1],[2] and CeCo₂P₂ is an antiferromagnet with a rather high Néel temperature T_N = 440 K [3], most likely due to an interplay of 3d and 4f magnetism, although Ce is close to a non-magnetic Ce⁴⁺ state.

Here, we present the high-temperature metal-flux technique that was used to obtain millimeter-sized single crystals. Furthermore, we show magnetic measurements for both systems. CeCo₂P₂ shows anisotropic behavior above the ordering temperature, which is unexpected for itinerant 3d magnetism. CeRu₂P₂ as a reference system without the d magnetism of Co also shows anisotropic behavior and may indicate that CeCo₂P₂ also exhibits some remaining Ce 4f magnetism [4].

[1] A. Amorese et al., Phys. Rev. B 93, 165134 (2016)

[2] T. Fujiwara et al., J. Phys.: Conf. Ser. 273, 012112 (2011)

[3] Y. Tian et al., Physica B 512, 75 (2017)

[4] K. Kliemt et al., Cryst. Res. Technol., 1900116 (2019)