Spectroscopic Study of Magnetic Phenomena in DyPO4, DyAsO4, and DyVO4.
Abstract
The nearest-neighbor interactions in DyPO4, DyAsO4, and DyVO4 produce a five-line structure in the absorption lines. The relative intensities of the five lines have been measured to obtain the relative populations of the five possible nearest-neighbor spin-configurations as a function of temperature. Ordering temperatures have been found for each crystal by locating the sudden change in the relative intensities. The relative intensities of DyPO4 have been fit with a theoretical B.P.W. calculation for an Ising system. The Zeeman behavior of the three crystals has also been examined. A spin-flip phase transition is found to occur in DyPO4. Two phase transitions have been found in DyAsO4 and DyVO4, but the character of these transitions could not be determined. DyPO4 has been identified as an example of the theoretical three-dimensional Ising model. DyAsO4 and DyVO4 are quite different from DyPO4 and appear to be similar to an X-Y model. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1970
- Accession Number
- AD0714692
Entities
People
- John C. Wright
Organizations
- Johns Hopkins University