New Co spinel compound SiCo 2 O 4 have been synthesized by using the high-pressure synthesis technique. High frequency ESR measurements of powder samples of SiCo 2 O 4 have been performed by using the pulsed magnetic field up to 16 T in the frequency range from 60 GHz to 540 GHz. From the frequencyfield diagram at 1.8 K two critcal field resonances are observed at 1.7 T, which correspond to the field of the metamagnetic transition and 2.3 T. The g-values are estimated to be 6.7 and 4.5 from the ESR mode in the field induced ferromagnet phase.
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