Development of a high-field ESR system under high pressure

Abstract

We developed a new high-field ESR system under pressure. A clamped-type pressure cell with sapphire pistons is used to transmit the electromagnetic wave. The first measurements on the spin-Peierls system CuGeO 3 under pressure and our development of the new standard of pressure for high-field ESR are presented.

Frequency Extension to the THz Range in the High Pressure ESR System and Its Application to the Shastry–Sutherland Model Compound SrCu2(BO3)2

“…And it does not reach 1 GPa even if several parts are replaced by that made of the tougher ZrO 2 -based ceramic. [5][6][7][8][9][10][11][12][13][14][15] On the other hand, the ZrO 2 -based ceramic has very high toughness and it is much cheaper than sap-phire. However, the ZrO 2 -based ceramic does not have enough transmission especially for the higher frequency region.…”

“…Náfrádi et al whose system is a similar type with us started their development later than us and they have the system with the maximum field up to 16 T, the pressure region up to 1.6 GPa and the frequency region from 105 to 420 GHz. 2 On the other hand, in our systems the frequency can be varied very widely, which includs the socalled THz region defined as the frequency region from 0.1 to 10 THz, 4 since we simply combine the piston-cylinder pressure cells with the transmission-type high-field ESR system using the pulsed high magnetic field [5][6][7][8][9][10][11][12][13][14][15][16][17][18] or the static magnetic field. 1,[19][20][21][22] The most characteristic point of our pressure cell is that all inner parts are made of sapphire and ZrO 2 -based ceramic.…”

“…Therefore, our high-pressure ESR systems have proved to be one of the most powerful means to study quantum spin systems. 1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] So far, we developed the pressure cell with the moderate pres- Phase diagram for the Shastry-Sutherland model. 26 sure range below 1 GPa and the wide frequency region from 70 to 700 GHz, [5][6][7][8][9][10][11][12][13][14][15] and that with the higher pressure range up to 1.5 GPa and the limited frequency region from 70 to 400 GHz.…”

“…1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] So far, we developed the pressure cell with the moderate pres- Phase diagram for the Shastry-Sutherland model. 26 sure range below 1 GPa and the wide frequency region from 70 to 700 GHz, [5][6][7][8][9][10][11][12][13][14][15] and that with the higher pressure range up to 1.5 GPa and the limited frequency region from 70 to 400 GHz. 1,[16][17][18][19][20] Recently, we also developed a hybrid-type pressure cell with larger sample space and higher pressure region for large bore magnet, which covers the frequency region form 50 to 400 GHz and the pressure up to 2.5 GPa.…”

Development of high-pressure and high-field ESR system using SQUID magnetometer

“…However, most of the existing high-pressure ESR systems are limited to the low frequency range such as X-band. The authors have developed a millimeter and submillimeter wave transmission-type pressure cell and applied it to the single-pass transmission ESR system using pulse high magnetic field setups [22][23][24][25][26]. The system has a wide frequency range from 70 to 700 GHz [23,24], a pressure range up to 1.1 GPa, a temperature region from 1.8 to 4.2 K [24] and a magnetic field up to 55 T [25].…”