“…This assumption is consistent with our field-dependent measurement results ( Fig.2-b,c). Furthermore, the thermal expansion coefficient of GGG crystal, i.e., α T = 1 a da dT , is of the order of 7 × 10 −7 K −1 within the temperature range of 6-310 K [78,79], with a being the lattice constant. Therefore, the sample thickness is not expected to show a considerable temperature dependence, and the FR and Verdet constant are expected to exhibit the same temperature dependence.…”