Magnetization and NMR studies of the spin antiferromagnet on the kagome lattice

Abstract Magnetization and 1 H-NMR measurements of the s = 1 2 kagome lattice antiferromagnet, [Cu 3 (titmb) 2 (CH 3 CO 2 ) 6 ]·H 2 O, have been performed between 1.5 and 300 K to study the magnetic properties in the quantum spin frustrated magnet. The measured susceptibility obeys the Curie-Weiss law and no magnetic phase transition was observed down to 1.5 K. The spin-lattice relaxation rate T 1 −1 shows that the ground state is singlet and the first excited state is triplet separated by the energy gap.