Abstract
The magnetic properties and magnetic phase transition critical behavior of Gd3Ga5O12 single crystals subjected to high-pressure heat treatment were investigated. The results show that high-pressure heat treatment reduces the Curie temperature and magnetization of the sample. Under a magnetic field change of 5 T, the maximum isothermal magnetic entropy of the sample is approximately 19.73 J/(kg·K). High-pressure heat treatment increases the phase transition temperature range and leads to an increase in the magnetic refrigeration power. Both Gd3Ga5O12 single crystals and the high-pressure heat-treated sample undergo a second-order phase transition. The critical behavior of the samples aligns with the mean field model acquired via critical model fitting. This indicates that the samples exhibit long–range exchange interactions in the system near the Curie temperature. Thus, this material can be used as a magnetic refrigerant for low-temperature applications.
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