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

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arxiv cond-mat/0511357 v1 pith:64PBXU4H submitted 2005-11-14 cond-mat.str-el cond-mat.supr-con

D. Wang , M.D. Hossain , Z. Salman , D. Arseneau , K.H. Chow , S. Daviel , T.A. Keeler , R.F. Kiefl
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S.R. Kreitzman C.D.P. Levy G.D. Morris R.I. Miller W.A. MacFarlane T.J. Parolin H.Saadaoui
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classification cond-mat.str-elcond-mat.supr-con
keywords fieldbetaelectrich-nbselinemagneticnormalnuclear
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abstract

$\beta$-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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