Abstract

The low dimensional spin system Cu 2(PO 3) 2CH 2 has been investigated by means of NMR spectroscopy. 31P NMR measurements were performed in the temperature range 2–200 K. Above T c ∼ 10 K the 31P NMR spectra consist of two distinct peaks which coincides with two non equivalent crystallographic P sites. Below 10 K a convergence of both peaks is observed. The chemical shift tends to approach the constant value at T → 0 evidencing for the gap formation in the magnetic excitation spectrum. These results are analyzed in frames of both alternating spin chain and dimer models.

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