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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.14: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

High-field magnetization and magnetoelasticity of single crystalline HoFe₅Al₇ — •S. Yasin¹, A.V. Andreev², D. Gorbunov², Y. Skourski¹, S. Zherlitsyn¹, and J. Wosnitza¹ — ¹Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — ²Institute of Physics ASCR, Na Slovance 2, 18221 Prague 8, The Czech Republic

Magnetization and ultrasound measurements have been performed in pulsed magnetic fields up to 60 T on a ferrimagnetic HoFe₅Al₇ single crystal (Curie temperature T_C = 213 K, compensation point T_comp = 65 K) with tetragonal crystal structure of ThMn₁₂ type. The compound poses an "easy-plane" magnetic anisotropy with the easy magnetization direction along the [110] axis and spontaneous magnetic moment M_s = 2 µ_B/f.u. at T = 2 K. For the magnetic field applied along this direction two field-induced magnetic transitions of first-order are observed. The presence of both transitions is accompanied by sharp anomalies in the acoustic properties. The temperature dependences of the critical fields as well as the shape of the acoustic anomalies suggest a different nature of the above magnetic transitions. The magnetoelastic study has been supplemented with magnetization measurements under hydrostatic pressure. T_C decreases with a rate dT_C/dp = -10 K/GPa, whereas T_comp increases with dT_comp/dp = 3.5 K/GPa. We discuss our results in relation to the exchange interactions of the Ho-Fe sublatices. *Part of this work was supported by EuroMagNET under the EU contract No. 228043.