Anisotropic magnetism and magnetocaloric effects in RE3Ni5Al19 (RE = Ho and Er) single crystals
Source abstract
Abstract
We report the crystal structure, magnetic properties, and magnetocaloric effect of RE 3Ni 5Al 19 ( RE = Ho and Er) single crystals. The rod-like Ho 3Ni 5Al 19 and Er 3Ni 5Al 19 single crystals were grown by Al flux. Powder X-ray diffraction patterns show that Ho 3Ni 5Al 19 and Er 3Ni 5Al 19 exhibit the orthorhombic Gd 3Ni 5Al 19-type structure with space group Cmcm. Magnetic measurements reveal that Ho 3Ni 5Al 19 and Er 3Ni 5Al 19 undergo a paramagnetic (PM)-antiferromagnetic (AFM) transition at 11 K and 2.3 K, respectively. Ho 3Ni 5Al 19 exhibits significant magnetic anisotropy with the easy direction along the a axis, and field-induced multistep metamagnetic transition appears along the a axis below 6 K. In contrast, the easy direction of Er 3Ni 5Al 19 is parallel to the bc plane. The maximum magnetic entropy changes of Ho 3Ni 5Al 19 and Er 3Ni 5Al 19 are −11.9 J/kg K and −13.2 J/kg K under a magnetic field change of 70 kOe. The corresponding values of refrigeration capacity are evaluated to be 256.9 J/kg and 251.1 J/kg, respectively. Moreover, a considerable rotating magnetocaloric effect is also obtained, with the maximum rotating magnetic entropy changes of −8.5 J/kg K and −10.9 J/kg K under 70 kOe for Ho 3Ni 5Al 19 and Er 3Ni 5Al 19, respectively.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Rare-earth and actinide compounds · Magnetic Properties of Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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