High-field ESR measurements of CsCuCl3 under pressure

Development of high-pressure, high-field and multifrequency electron spin resonance system

“…Consequently, it causes a heating of a sample when a heat flow occurs from the pressure cell to a sample. 9,10 The important physical quantities are the electric resistance of the cylinder and the thermal diffusivities of materials between a sample and the cylinder. Since the electric resistance of the cylinder determines the quantity of the eddy current, the higher resistance cylinder has a lower Joule heat that occurs under the same charging voltage.…”

“…In this article, we will present a further improved system which reaches a pressure of 1.1 GPa. A few problems caused by an eddy current, 9,10 which often disturb precise measurements in experiments with a combination of the pulsed magnetic field and the pressure cell, have been almost solved in this system. In addition to the outline of this ESR system, an application to an isolated spin system will be demonstrated.…”

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.…”

“…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.…”