Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 60: Correlated Electrons: f-Electron Systems
TT 60.14: Vortrag
Donnerstag, 23. März 2017, 13:00–13:15, HSZ 201
Frustrated local moment magnetism in a metallic system: Ce6Ni6P17 — •Diego Franco and Christoph Geibel — Max-Planck-Institut für Chemische Physik Fester Stoffe
Frustrated metallic systems are potentially of strong interest because the interaction between magnetic and itinerant degrees of freedom is expected to result in unusual properties. However the number of appropriate systems is extremely scarce. Because of its structure the polyphosphide Ce6Ni6P17 is an attractive candidate. Ce atoms are located on the corners of octahedra, which form a body centered cubic lattice. Thus one might expect frustration within the octahedra and frustration because of the body centered arrangement of the octahedra [1]. A preliminary study provided some evidence for frustration, but presented only limited experimental results [1]. We synthesized polycrystalline samples and present magnetization, specific heat and resistivity data. Our results confirm Ce6Ni6P17 to be a metallic, frustrated local moment system. Kondo interaction are negligible resulting in well-defined 4f local moments. Specific heat C(T)/T data evidence magnetic order at merely TN = 0.97 K, with only a small anomaly at TN compensated by a huge tail in C(T)/T extending far above TN. The magnetic fluctuations indicated by this large tail in C(T)/T are also seen as a broad maximum in χ(T) at T > TN. Thus Ce6Ni6P17 is a very promising candidate for studying magnetic frustration in a metallic system.
[1] N. Takeda et al., J. Phys. : Conf. Series 391 (2012) 012071