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We have made a survey of ceramics for the inner parts of thetransmission-type pressure cell to achieve the high pressure and the hightransmission in THz range. By using the optimal combination of ZrO$_{2}$-basedceramic and Al$_{2}$O$_{3}$ ceramic, we have succeeded in obtaining thepressure up to 1.5 GPa and the frequency region up to 700 GHz simultaneously.We show the high-pressure ESR results of Shastry-Sutherland compoundSrCu$_{2}$(BO$_{3}$)$_{2}$ as an application. We observed the direct ESRtransition modes between the singlet ground state and the triplet excitedstates up to the pressure of 1.51 GPa successfully, and obtained the precisepressure dependence of the gap energy. The gap energy is directly proved to besuppressed by the pressure. Moreover, we found that the system approaches thequantum critical point with pressure by comparing the obtained data with thetheory. This result also shows the usefulness of high-pressure ESR measurementin THz region to study quantum spin systems.

Frequency Extension to THz Range in High Pressure ESR System and Its Application to Shastry-Sutherland Model Compound SrCu$_{2}$(BO$_{3}$)$_{2}$