title: High-field magnetization and magnetoelasticity of single crystalline HoFe5Al7.
abstract: Magnetization and ultrasound measurements have been performed in pulsed magnetic fields up to 60 T on a ferrimagnetic HoFe5Al7 single crystal (Curie temperature TC = 216 K, compensation point Tcomp = 65 K) with a tetragonal crystal structure of the ThMn12-type. The compound exhibits a high magnetic anisotropy of the easy-plane type. A large anisotropy is also observed within the basal plane having an easy-magnetization direction along the [110] axis with the spontaneous magnetic moment Ms = 2 µB/f.u. at T = 2 K. Along the easy axis, two first-order field-induced magnetic transitions are observed. At both transitions sharp anomalies in the acoustic properties are found. The critical fields of the transitions depend on temperature in a different manner. Within molecular-field theory and using the high-field magnetization data the Ho-Fe inter-sublattice exchange parameter has been determined to be nHoFe ≈ 4 T/µB. The magnetoelasticity has also been probed by 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.
authors.affiliation: Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic. Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, 121 16 Prague, Czech Republic.
authors.forename: D I
authors.initials: DI
authors.lastname: Gorbunov
authors.forename: S
authors.initials: S
authors.lastname: Yasin
authors.forename: A V
authors.initials: AV
authors.lastname: Andreev
authors.forename: Y
authors.initials: Y
authors.lastname: Skourski
authors.forename: Z
authors.initials: Z
authors.lastname: Arnold
authors.forename: S
authors.initials: S
authors.lastname: Zherlitsyn
authors.forename: J
authors.initials: J
authors.lastname: Wosnitza