Magnetism of Cu_6 Ge_6 O_{18}-x H_2 O (x = 0 ~ 6), a compound of the one-dimensional Heisenberg $S=1/2$ model with competing antiferromagnetic interactions

Masashi Hase, Kiyoshi Ozawa, Norio Shinya

We measured the magnetic susceptibilities of Cu${}_6$Ge${}_6$O${}_{18}$-xH${}_2$O ($x=0\sim 6$). Susceptibility above the antiferromagnetic (AF) transition temperature ($T_{\mathrm{N}}$) agr…