Abstract
Single-crystalline has been grown by a floating-zone melting method, and its magnetic, thermal, and transport properties have been investigated through measurements of magnetization, specific heat, and electrical resistivity to reveal its peculiar magnetism. It is shown that undergoes a second-order phase transition at = 19 K, which had been believed to be ferromagnetic ordering in the literature, from a paramagnetic phase to an uncompensated antiferromagnetic phase with spontaneous magnetization along the tetragonal axis (the easy magnetization direction). The magnetic entropy analysis points to the itinerant character of electrons in the magnetic ordered state of with large enhancement of the electronic specific heat coefficient of mJ/ at 2 K. It also reveals the relatively isotropic crystalline electric field effect of this compound, with contrast to the other relative isostructural compounds. The observed magnetization curves strongly suggest that there is a parasitic ferromagnetic component developing below K in high coercivity with the easy axis along the tetragonal axis. The results are discussed in the context of evolution of magnetism within the entire family of isostructural compounds.
14 More- Received 19 August 2016
- Revised 18 November 2016
DOI:https://doi.org/10.1103/PhysRevB.94.214414
©2016 American Physical Society