TY - JOUR
T1 - Frequency Extension to the THz Range in the High Pressure ESR System and Its Application to the Shastry-Sutherland Model Compound SrCu2(BO3)2
AU - Ohta, Hitoshi
AU - Sakurai, Takahiro
AU - Matsui, Ryosuke
AU - Kawasaki, Kohei
AU - Hirao, Yuki
AU - Okubo, Susumu
AU - Matsubayashi, Kazuyuki
AU - Uwatoko, Yoshiya
AU - Kudo, Kazutaka
AU - Koike, Yoji
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/10/29
Y1 - 2015/10/29
N2 - We have made a survey of ceramics for the inner parts of the transmission-type pressure cell to achieve the high pressure and the high transmission in the THz range. By using the optimal combination of ZrO2-based ceramic and Al2O3 ceramic, we have succeeded in obtaining a pressure up to 1.5 GPa and a frequency region up to 700 GHz simultaneously. We show the high-pressure ESR results of the Shastry-Sutherland compound SrCu2(BO3)2 as an application. We observed the direct ESR transition modes between the singlet ground state and the triplet excited states up to a pressure of 1.51 GPa successfully, and obtained the precise pressure dependence of the gap energy. The gap energy is directly proved to be suppressed by the pressure. Moreover, we found that the system approaches the quantum critical point with pressure by comparing the obtained data with the theory. This result also shows the usefulness of high-pressure ESR measurement in the THz region to study quantum spin systems.
AB - We have made a survey of ceramics for the inner parts of the transmission-type pressure cell to achieve the high pressure and the high transmission in the THz range. By using the optimal combination of ZrO2-based ceramic and Al2O3 ceramic, we have succeeded in obtaining a pressure up to 1.5 GPa and a frequency region up to 700 GHz simultaneously. We show the high-pressure ESR results of the Shastry-Sutherland compound SrCu2(BO3)2 as an application. We observed the direct ESR transition modes between the singlet ground state and the triplet excited states up to a pressure of 1.51 GPa successfully, and obtained the precise pressure dependence of the gap energy. The gap energy is directly proved to be suppressed by the pressure. Moreover, we found that the system approaches the quantum critical point with pressure by comparing the obtained data with the theory. This result also shows the usefulness of high-pressure ESR measurement in the THz region to study quantum spin systems.
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U2 - 10.1021/acs.jpcb.5b03664
DO - 10.1021/acs.jpcb.5b03664
M3 - Article
AN - SCOPUS:84946096240
SN - 1520-6106
VL - 119
SP - 13755
EP - 13761
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 43
ER -