Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.18: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Spontaneous and field-induced magnetic phase transitions in Dy₂Co₃Al₉ — •D.I. Gorbunov¹, M.S. Henriques², C. Salazar Mejía¹, J. Gronemann¹, A.V. Andreev², M. Uhlarz¹, Y. Skourski¹, and J. Wosnitza^1,3 — ¹Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany — ²Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic — ³Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany

In the crystal structure of Dy₂Co₃Al₉, there are various Dy-Dy interatomic distances with similar values. Due to the poorly compensated exchange and anisotropy interactions acting on the Dy spins, a magnetically stable state is difficult to achieve and the system displays a number of spontaneous and field-induced magnetic phase transitions as revealed by means of magnetization, specific-heat, and electrical-resistivity measurements. Antiferromagnetic ordering sets in at the Néel temperature, T_N = 6.2 K, followed by two additional phase transitions at 5.2 and 3.7 K in zero field. In applied magnetic fields, new phases emerge. The field-dependent magnetization exhibits multiple jumps accompanied by large magnetoresistance changes. The magnetoresistance can be explained by modified conduction-electron spectra since the conduction electrons interact with the localized magnetic moments.