Abstract
Electron spin resonance (ESR) and magnetization measurements have been performed on the diluted Haldane system (CH 3 ) 4 NNi 1- x Zn x (NO 2 ) 3 (Zn 2+ :TMNIN). We observed ESR absorption from the S =1/2 moment at the end of the Ni 2+ chains at low temperatures. The dependence of the ESR absorption intensity on temperature and the concentration of Zn 2+ are compared to the theory derived from the valence bond solid (VBS) model by Mitra, Halperin and Affleck (Phys. Rev. B 45 (1992) 5299). The paramagnetic contribution to the magnetization of Zn 2+ :TMNIN increases with Zn 2+ concentration. We find that on average, one S =1/2 moment appears on each segment of finite chains at low temperatures.
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