Abstract

A study is made of the anomalous fine structure of the proton magnetic resonance line shape in CuSO4.5H2O in weak field and at low temperature. Additionally, measurements are performed on the transverse relaxation rate of the proton spins with the use of a phase coherent spectrometer. A complete explication is given of the characteristic dependence of both the continuous wave and the transient line shape on the strength and orientation of the magnetic field and the temperature. The results show that the fine structure is due to an indirect nuclear spin-spin coupling between the studied proton spins and the copper nuclear spins via the electron spins which are situated at the (12,12, 0) sites in the unit cell. The indirect spin-spin coupling has also a strong influence on the transverse relaxation rate of the proton spins.

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