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Development and applications of high-frequency ESR up to 55 T

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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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Authors and Affiliations

  1. Molecular Photoscience Research Center, Kobe University, Kobe, Japan

    Hitoshi Ohta & S. Okubo

  2. Graduate School of Science and Technology, Kobe University, Kobe, Japan

    Hitoshi Ohta, N. Souda & M. Tomoo

  3. Center for Support to Research and Education Activities, Kobe University, Kobe, Japan

    Hitoshi Ohta & T. Sakurai

  4. Graduate School of Science, Kobe University, Kobe, Japan

    Hitoshi Ohta, T. Yoshida & E. Ohmichi

  5. Development of Frontier Research and Technology, Kobe University, Kobe, Japan

    Hitoshi Ohta & M. Fujisawa

  6. Department of Physics, Tokyo Institute of Technology, Tokyo, Japan

    H. Tanaka

  7. Condensed Molecular Materials Laboratory, Japan Science and Technology Agency, Core Research for Evolutional Science and Technology, Institute of Physical and Chemical Research, Saitama, Japan

    R. Kato

  8. Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, 657-8501, Japan

    Hitoshi Ohta

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  1. Hitoshi Ohta
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  2. S. Okubo
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  3. N. Souda
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  4. M. Tomoo
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  5. T. Sakurai
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  6. T. Yoshida
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  7. E. Ohmichi
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  8. M. Fujisawa
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  9. H. Tanaka
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  10. R. Kato
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Correspondence to Hitoshi Ohta.

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Ohta, H., Okubo, S., Souda, N. et al. Development and applications of high-frequency ESR up to 55 T. Appl Magn Reson 35, 399–410 (2009). https://doi.org/10.1007/s00723-009-0171-7

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  • DOI: https://doi.org/10.1007/s00723-009-0171-7

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