Abstract
The magnetic properties of the quasi-one-dimensional magnet AM3+Si2O6 (A=Li, Na; M=Ti, V, Cr) have been investigated in the light of the number of d-electron (spin number). The Ti(d1)-compound shows a spin-Peierls like transition at the temperature higher than that (TMAX) at the maximum point of the Bonner–Fisher curve, and the ground state is spin-singlet. The V(d2)- and Cr(d3)-compounds do not show such transition and the ground states are long range antiferromagnetic ordered states. The TMAX, where a short-range magnetic correlation within the chain is fully developed, decreases with increasing the M–M distance within the chain in the compounds with a fixed dn. On the other hand, it decreases with increasing the number of d-electron in the Na-based compounds, although the M–M distance within the chain becomes shorter with increasing the number of d-electron. Any other factor such as the second nearest interaction or orbital degree of freedom should be taken into the consideration for the explanation of the TMAX variation with the number of d-electron.
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