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TT: Fachverband Tiefe Temperaturen

TT 72: Low-Dimensional Systems: Poster Session

TT 72.15: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Field and angle dependent magnetoresistance oscillations in the normal and antiferromagnetic states of κ-(BETS)₂FeX₄ (X = Cl, Br) — •Michael Kunz¹, Ludwig Schaidhammer¹, Werner Biberacher¹, Natasha D. Kushch², and Mark V. Kartsovnik¹ — ¹Walther- Meißner-Institut, Garching, Germany — ²Institute of Problems of Chemical Physics, Chernogolovka, Russia

The bifunctional materials κ-(BETS)₂FeX₄ (X = Cl, Br) are layered organic metals exhibiting both metallic and superconducting behaviour while carrying localised magnetic moments. These compounds show an anitferromagnetic ground state with Néel temperatures T_N of 0.46 K and 2.5 K respectively, while the electron system remains metallic even below T_N. Studies of field and angular sweeps of the interlayer magnetoresistance for different field directions revealed different kinds of angular-magnetoresistance-oscillations (AMRO) as well as Shubnikov-de Haas (SdH) oscillations. The experimental data will be discussed in the context of the Fermi surface properties and their response to the antiferromagnetic ordering.