Spontaneous and field-induced phase transitions in TbFe.sub.5./sub.Al.sub.7./sub..

0432287 - FZÚ 2015 RIV NL eng J - Journal Article
Gorbunov, Denis - Yasin, S. - Andreev, Alexander V. - Mushnikov, N. V. - Skourski, Y. - Zherlitsyn, S. - Wosnitza, J.
Spontaneous and field-induced phase transitions in TbFe₅Al₇.
Journal of Magnetism and Magnetic Materials. Roč. 535, Sep (2014), 56-63. ISSN 0304-8853. E-ISSN 1873-4766
R&D Projects: GA ČR GAP204/12/0150
Grant - others:AVČR(CZ) M100101203
Institutional support: RVO:68378271
Keywords : rare-earth intermetallics * ferrimagnetism * magnetic anisotropy * spin-reorientation transition * high magnetic fields * field-induced transition
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.970, year: 2014

Magnetization and ultrasound measurements have been performed on TbFe5Al7 single crystal (tetragonal crystal structure) at 2-260 K in steady (up to 18 T) and in pulsed magnetic fields (up to 60 T). The compound is a ferrimagnet below 242 K having an easy-plane anisotropy. Strong anisotropy is also present within the basal plane. At 2 K, the easy magnetization direction is the [100] axis. In the vicinity of the compensation temperature, Tcomp = 84 K, TbFe5Al7 displays a spin-reorientation transition from [100] to the [110] axis accompanied by pronounced anomalies in the relative sound-velocity change and sound attenuation. Field-induced magnetic transitions have been observed by magnetization and acoustic measurements. The Tb-Fe inter-sublattice exchange constant has been determined directly from the high-field data and using molecular-field theory.
Permanent Link: http://hdl.handle.net/11104/0236703