Development and applications of high-frequency ESR up to 55 T |
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| Authors: | Hitoshi Ohta S. Okubo N. Souda M. Tomoo T. Sakurai T. Yoshida E. Ohmichi M. Fujisawa H. Tanaka R. Kato |
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| Affiliation: | (1) Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada Kobe, 657-8501, Japan;(2) Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada Kobe, 657-8501, Japan;(3) Headquarters for Innovative Cooperation and Development, Kobe University, 1-1 Rokkodai-cho, Nada Kobe, 657-8501, Japan |
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| Abstract: | A multiextreme (high-field, low-temperature, high-pressure and nanoscale) electron spin resonance (ESR) measurement system is under development in Kobe. In this connection, our recent development is introduced and two applications of our high-frequency high-field ESR are described. High-frequency high-field ESR measurements of dioptase (Cu6Si6O18·6H2O), which has an interesting antiferromagnetic Cu2+ network, have been performed using a pulsed magnetic field of up to 55 T. Antiferromagnetic resonances (AFMR) are clearly observed at 4.2 K with the light sources of up to 1017 GHz. However, a deviation from the conventional two-sublattice AFMR theory is observed in the high field. Temperature dependence of the X-band and high-frequency ESR has been also observed in the triangular lattice antiferromagnet EtMe3P[Pd(dmit)2]2 which shows the spin-Peierls-like transition below T c = 25 K. The preliminary field dependence of the spin gap estimated from the analyses of our ESR results has been shown in connection with the previous magnetic susceptibility results. |
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