Abstract
The ground-state properties of the perovskites and were investigated by magnetization, magnetic ac susceptibility, and specific heat measurements. A strongly anisotropic behavior has been detected for temperatures below the antiferromagnetic phase transition The susceptibility and the weak spontaneous ferromagnetic moment appear to be different in both compounds due to different anisotropic rare-earth contributions. The specific heat shows strong Schottky-type contributions at low temperatures, which for strongly depend on the magnetic field. A spin reorientation phase transition (spin-flop type) induced by a magnetic field along the b axis was observed in at and All results can consistently be explained by anisotropic contributions of the rare-earth ions: In the electronic ground state is determined by a low-lying quasidoublet split by the crystal field In the Kramers doublet is split by the Nd-Mn exchange field
- Received 22 August 2003
DOI:https://doi.org/10.1103/PhysRevB.69.064418
©2004 American Physical Society