Regensburg 2013 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 12: Poster 1
DF 12.14: 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 TC = 213 K, compensation point Tcomp = 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 Ms = 2 µB/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. TC decreases with a rate dTC/dp = -10 K/GPa, whereas Tcomp increases with dTcomp/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.