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TT: Fachverband Tiefe Temperaturen

TT 43: Frustrated Magnets - Strong Spin-Orbit Coupling 2 (joint session TT/MA)

TT 43.2: Vortrag

Mittwoch, 18. März 2020, 15:15–15:30, HSZ 304

The evolution of magnetic frustration in HoInAg_2−xAu_x — •Johanna Oefele¹, Oliver Stockert², Philipp Gegenwart¹, and Veronika Fritsch¹ — ¹EP6, Electronic Correlations and Magnetism, Augsburg University, Germany — ²Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

While the intermetallic compounds HoInAg₂ and HoInAu₂ share the same face-centered cubic crystal structure and are isoelectronic, the magnetic properties significantly deviate from each other. HoInAg₂ is strongly frustrated as evidenced by its thermodynamic properties and a large frustration parameter. In contrast the HoInAu₂ system shows no signs of magnetic frustration. In order to explore the transition from the frustrated to the non-frustrated system we synthesised the substitution series HoInAg_2−xAu_x.

In this talk I will present the crystal growth and the susceptibility, specific heat and the resistivity measurements on our polycrystalline samples. The effective paramagnetic moments extracted from the magnetic susceptibility coincide with the value expected for free Ho³⁺. From the specific heat the entropy was calculated confirming the presence of magnetic frustration in HoInAg₂. With increasing substitution of Ag with Au the Néel temperature is monotonically increasing, while the frustration vanishes.