Abstract
Multi-frequency ESR measurements of S = 1/2 phyrochlore system ZnxCu4-x(OH)6Cl2(x = 0 ∼ 0.5) have been performed using the pulse magnetic field up to 16 T and in the frequency region from 30 GHz to 360 GHz. Temperature dependence ESR measurement of the distorted pyrochlore system (x = 0) from 1.76 K to 265 K shows the linewidth broadening below 20 K, and the coexistence of AFMR modes and the peculiar mode is suggested below 6 K. Moreover, the x dependence measurements at 1.8 K suggest the existence of phase boundaries around x = 0.3 and 0.5. Possible model to interpret the result will be presented.
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