Abstract
Single crystals of SrFeCoO solid solution with high valence ions (Fe/Co) were synthesized by combining floating-zone and high-pressure oxygen-annealing techniques. As the Co content () is increased, the ground state changes from the helimagnetic state ( ≤ 0.05) through cluster glass to the ferromagnetic state ( ≥ 0.2), with a high Curie temperature ranging between 245 and 337 K. We found that, within the helimagnetic state ( ≤ 0.05), several different magnetic phases, which possibly reflect versatile three-dimensional helical orders with multiple wave vectors, emerge depending on temperature and magnetic field strength. In addition, we observed Co-concentration–dependent systematic evolution of the complex magnetic phase diagram. Resonant soft x-ray diffraction measurements revealed a gradual decrease in the wave vector of the helix toward the ferromagnetic phase.
2 More- Received 9 April 2012
DOI:https://doi.org/10.1103/PhysRevB.86.064436
©2012 American Physical Society