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THz ESR Study of Peculiar Co Pyrochlore System GeCo2O4 Using Pulsed High Magnetic Field

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Abstract

THz electron spin resonance (ESR) measurements of the spinel compound GeCo2O4, which consists of the Co2+ pyrochlore structure, were performed. The temperature dependence measurements revealed new antiferromagnetic phases, AF1 and AF2, below TN. Moreover, a wide magnetic field range of ESR study using a single crystal at 1.8 K also revealed various field-induced phases due to the competition between the spin–lattice coupling and the spin frustration. Critical field resonances were observed at 5.0 T, 8.6 T, and 11.0 T for B//[111] and 5.1 T, 7.7 T, 11.2 T, and 13.0 T for B//[110] at 1.8 K. Although it became difficult to observe ESR above 86 K, the g-values of Co2+ ions were estimated to be g[111] = 3.34 and g[110] = 3.27 for [111] and [110], respectively, from the observed ESR mode above the saturation field at 1.8 K. Detailed frequency-field diagrams of the ESR modes at 1.8 K suggested the existence of spin–lattice coupling energy of 250 GHz (= 1.03 meV = 12 K) at the critical field resonances. The spin gap mode in the frequency-field diagram at 1.8 K showed excitation energies of E[111] = 1004 GHz (= 4.15 meV = 48 K) and E[110] = 1044 GHz (= 4.32 meV = 50 K) for [111] and [110], respectively. These results will be discussed in connection with the di-tetramer model suggested previously.

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Notes

  1. The critical field resonance has been pointed out theoretically by Nagamiya and Nagamiya [41] and has been observed experimentally by M. Data group [42]. The detailed angular dependence measurements of the critical field resonance for antiferromagnet CuCl2·2H2O has been reported by K. Nagata. The absorption intensity of the critical field resonance decreases abruptly, when the applied magnetic field parallels absolutely the easy axis within 0.1° [43].

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Acknowledgements

SO and HO are very grateful for their fruitful discussions with Prof. T. Sakai (University of Hyogo).

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Authors and Affiliations

  1. Molecular Photoscience Research Center, Kobe University, Kobe, 657-8501, Japan

    Susumu Okubo, Hitoshi Ohta & Wei-min Zhang

  2. Graduate School of Science, Kobe University, Kobe, 657-8501, Japan

    Susumu Okubo, Hitoshi Ohta, Tatsuya Ijima & Tatsuya Yamazaki

  3. Center for Supports To Research and Education Activities, Kobe University, Kobe, 657-8501, Japan

    Shigeo Hara

  4. National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8568, Japan

    Shinichi Ikeda

  5. Institute of Material Science, University of Tsukuba, Tsukuba, 305-8577, Japan

    Hiroyuki Oshima

  6. Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8573, Japan

    Miwako Takahashi

  7. Department of Physics, Tohoku University, Sendai, 980-8578, Japan

    Keisuke Tomiyasu

  8. Department of Physics, College of Science and Technology, Nihon University, Tokyo, 101-8308, Japan

    Tadataka Watanabe

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  1. Susumu Okubo
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Okubo, S., Ohta, H., Ijima, T. et al. THz ESR Study of Peculiar Co Pyrochlore System GeCo2O4 Using Pulsed High Magnetic Field. Appl Magn Reson 52, 411–424 (2021). https://doi.org/10.1007/s00723-020-01295-x

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