Abstract This paper theoretically investigates the effects of crystal field and exchange interaction field on magnetic properties in dysprosium gallium garnet under extreme conditions (low temperatures and high magnetic fields) based on quantum theory. Here, five sets of crystal field parameters are discussed and compared. It demonstrates that, only considering the crystal field effect, the experiments can not be successfully explained. Thus, referring to the molecular field theory, an effective exchange field associated with the Dy–Dy exchange interaction is further taken into account. Under special consideration of crystal field and the exchange interaction field, it obtains an excellent agreement between the theoretical results and experiments, and further confirms that the exchange interaction field between rare-earth ions has great importance to magnetic properties in paramagnetic rare-earth gallium garnets.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11004005 and 60971019), the Young Scholars Fund of Beijing University of Chemical Technology, China (Grant No. QN0724).
Cite this article:
Wang Wei(王维), Qi Xin(祁欣), and Yue Yuan(岳元) Analyses of crystal field and exchange interaction of Dy3Ga5O12 under extreme conditions 2011 Chin. Phys. B 20 017502
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