High field ESR measurements of pyrochlore slab antiferromagnets Ba 2 Sn 2 Ga 3+x ZnCr 7−x O 22 (x=0,1, 3, 5, 6.9) have been performed in the millimeter wave region at temperatures from 4.2 K to 200 K. For Ba 2 Sn 2 Ga 3 ZnCr 7 O 22 (x = 0), the pyrochlore slab is fully filled with Cr 3+ ions, the line width of the ESR absorption line increased and the resonance fields shifted as the temperature was decreased. These tendencies were suppressed as the Cr 3+ concentration was decreased. The ESR results were compared with those of another frustrated magnet and mechanism of the resonance field shift was discussed.
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