Abstract
We report the pressure effect on the ferromagnetism of type-I clathrate Eu8Ga16Ge30 with TC = 36 K by means of the resistivity ρ and Hall coefficient RH measurements. With increasing pressure up to 11.4 GPa, TC increases up to 45 K. The concomitant decrease of ρ is attributed to the increase of the carrier concentration because the normal part of RH decreases with the ratio of −3.5%/GPa. At ambient pressure, ρ(T) has broad peak at T*=23 K. Upon pressurizing, the peak is weakened but remain visible at T* = 27 K even at P = 11.4 GPa. Our findings suggest that the anomaly at T* is not so sensitive to the cage size up to 11 GPa, where the cage volume is compressed to 87% of the value at ambient pressure.
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