SUBMILLIMETER-WAVE ESR OF TRIANGULAR-KAGOME ANTIFERROMAGNET CU9X2(CPA)(6)(X=CL, BR)

Cu9X2(cpa)(6) which has two-dimensional triangles-in-triangles kagome lattice magnetic structure is considered as frustrated spin system. Hi gh field ESR of Cu9X2(cpa)(6) powder have been performed in the submil limeter wave region at temperatures from 4.2 to 50 K. Both X = Cl and Br samples showed constant resonance field and the broadening of line width as the temperature was decreased. Observed resonances were nearl y isotropic in contrast with the ESR of usual Cu2+ substances with ani sotropic g-value. (C) 1998 Elsevier Science B.V. All rights reserved.