Abstract
The NMR Knight shift and the spin-lattice relaxation rate 1/ T 1 have been measured at Nb sites in two polymorphs of quasi one-dimensional zig-zag spin chain compounds CuNb 2 O 6 . The temperature ( T ) dependence of NMR-1/ T 1 of the monoclinic CuNb 2 O 6 indicates the existence of spin excitation gap (spin gap) whose magnitude (∼20 K) is consistent with the result of other kinds of measurements. The difference of the T -dependences between 1/ T 1 T and K is similar to that well-known for high- T c oxides. A simultaneous growing of the antiferromagnetic and the singlet correlation has been observed with decreasing T at around the temperature of the susceptibility maximum (≥20 K). Results of the NMR measurements for the orthorhombic CuNb 2 O 6 , which undergoes an antiferromagnetic transition at about 7.3 K, are also presented.
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