Large magnetoresistance and magnetocaloric effects in a magnetostrictive single crystal
Phys. Rev. B 113, 054431 – Published 18 February, 2026
DOI: https://doi.org/10.1103/n3p9-cm7r
Abstract
The ( earth) intermetallic compounds have garnered significant attention owing to their diverse magnetic structures and magnetotransport responses. Here, we report the anisotropic magnetic properties, magnetoresistance (MR), magnetostriction (MS), and magnetocaloric (MC) effect in a single crystal. With decreasing temperature, the Mn subsystems exhibit antiferromagnetic (AFM) ordering, while the Dy moments undergo ferromagnetic ordering at a critical temperature, resulting in an intermediate state between and . Below , the AFM interaction between the Mn and Dy subsystems results in a ferrimagnetic phase. Three field-induced phase transitions are observed along the axis. The transitions occurring below and above demonstrate pronounced metamagnetic characteristics. When the current is applied along the axis and the magnetic field along the axis, positive and negative MR effects with significant changes are observed at the critical magnetic field of the metamagnetic transitions below and above , respectively. A substantial positive MR of +81% is observed at 20 K under 9 T. Upon applying physical pressure, the MR effect is significantly reduced. During the metamagnetic transitions, a remarkable MS effect is observed, indicating strong spin-lattice coupling. The responses of Dy and Mn sublattices to the magnetic field yield a maximum magnetic entropy change of along the axis under the field change of 0–7 T near , suggesting a giant MC effect. This MC effect shows a plateaulike behavior across a broad temperature window from 39 to 60 K, making it a promising candidate for magnetic refrigeration applications.
