NMR study of the electronic state and Peierls transitions in NbSe3

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Abstract
93Nb relaxation time (T1) measurements have been carried out in the linear chain metal NbSe3. The characteristic temperature dependence of T1 when passing through the Peierls transition temperatures provides evidence for independent CDW formation in two of the three inequivalent columns of distorted prismatic cages in the monoclinic unit cell. A frequency-dependent T1 is reported, indicating that the electron motion is one-dimensional diffusion like. The anisotropy in the transport relaxation rate has been estimated to be about 2*102. The dependence of the frequency and orientation on the external magnetic field is analysed by taking into account the relaxation process due to the d core polarisation at omega e and due to the orbital relaxation at omega n. In consequence, it is shown that the atomic wavefunction of the conduction d electrons corresponds to dz2 symmetry with a slight admixture of dxz and dyz symmetry.

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