Analyses of crystal field and exchange interaction of Dy3Ga5O12 under extreme conditions |
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Authors: | Wang Wei Qi Xin Yue Yuan |
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Affiliation: | Department of Physics and Electronics, School of Science, Beijing University of Chemical Technology, Beijing 100029, China;Department of Physics and Electronics, School of Science, Beijing University of Chemical Technology, Beijing 100029, China;Department of Physics and Electronics, School of Science, Beijing University of Chemical Technology, Beijing 100029, China |
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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. |
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Keywords: | crystal field exchange interaction magnetic anisotropy rare-earth garnet |
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