Magnetic, thermal, and magnetocaloric properties of the holmium trialuminide HoAl${}_3$ with polytypic phases

Abstract

We investigate the magnetic, thermal, and magnetocaloric properties of the intermetallic HoAl${}_3$ compounds with two different crystal structures. The room-temperature equilibrium trigonal phase HoAl${}_3$ undergoes an antiferromagnetic (AFM) transition at the Neel temperature $T_{\mathrm{N}}^{\mathrm{tri}}=$ 9.8 K. The AFM ordering of the compound is strong against the magnetic field, so that inverse magnetocaloric effect (MCE) is found even under a magnetic field change of 0-50 kOe. The high-pressure cubic phase HoAl3, prepared by a rapid-solidification process, is antiferromagnetically ordered below $T_{\mathrm{N}}^{\mathrm{cub}}=$ 15 K. Magnetic and specific heat measurements reveal that this long-range AFM state becomes unstable as the temperature drops and then it is replaced by a magnetic glassy state below a spin freezing temperature $T_{\mathrm{f}}=$ 11 K. The successive changes in magnetic state result in complicated temperature and field dependence of the MCE at low temperatures.

arXiv commentJournal of Magnetism and Magnetic Materials Accepted

References in corpus (3)

• Inverse magnetocaloric effect in ferromagnetic Ni-Mn-Sn alloys
• Machine Learning Guided Discovery of Gigantic Magnetocaloric Effect in HoB${}_2$ Near Hydrogen Liquefaction Temperature
• Adiabatic temperature change in ErAl2/metal PIT wires: A practical method for estimating the magnetocaloric response of magnetocaloric composites

Cited by in corpus (1)

• Anisotropic magnetism of polymorphic ErAl3