Abstract
The magnetic and structural properties of single-crystal samples have been investigated by performing specific heat, susceptibility, neutron diffraction, and x-ray diffraction measurements. As the orbital-active ions with larger ionic size are gradually substituted by the orbital-inactive ions with smaller ionic size, the system approaches the itinerant electron limit with decreasing V-V distance. Then, various factors such as the Jahn-Teller distortion and the spin-orbital coupling of the ions on the A sites and the orbital ordering and electronic itinerancy of the ions on the B sites compete with each other to produce a complex magnetic and structural phase diagram. This phase diagram is compared to those of and to emphasize several distinct features.
2 More- Received 14 April 2015
DOI:https://doi.org/10.1103/PhysRevB.92.134410
©2015 American Physical Society