$β$-Detected NMR of $^8$Li in the Normal State of 2H-NbSe$_2$

Details $β$-Detected NMR of $^8$Li in the Normal State of 2H-NbSe$_2$ $β$-Detected NMR of $^8$Li in the Normal State of 2H-NbSe$_2$

2005-11-14

arxiv.org/abs/cond-mat/0511357v1

Physica B, 374-375, 239 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

accepted for publication in Physica B

Scientific paper

10.1016/j.physb.2005.11.064

$\beta$-NMR of isolated $^8$Li has been investigated in the normal state of 2H-NbSe$_2$. In a high magnetic field of 3T a single resonance is observed with a Gaussian line width of 3.5 kHz. The line shape varies weakly as function of magnetic field and temperature but has a strong orientation dependence. The nuclear electric quadrupole splitting is unresolved implying that the electric field gradients are 10-100 times smaller than in other non-cubic crystals. The nuclear spin relaxation rate is also anomalously small but varies linearly with temperature as expected for Korringa relaxation in a metal. These results suggest that Li adopts an interstitial position between the weakly coupled NbSe$_2$ layers and away from the conduction band.

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