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Giant Vortices Below the Surface of NbSe$_2$ Detected Using Low Energy $\beta$-NMR

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arxiv cond-mat/0703174 v1 pith:5KGTC4P5 submitted 2007-03-07 cond-mat.str-el cond-mat.supr-con

Z. Salman , D. Wang , K. H. Chow , M.D. Hossain , S.R. Kreitzman , T.A. Keeler , C.D.P. Levy , W.A. MacFarlane
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R.I. Miller G.D. Morris T.J. Parolin H. Saadaoui M. Smadella R.F. Kiefl
This is my paper · ORCID
classification cond-mat.str-elcond-mat.supr-con
keywords vortexcorefieldlatticemagneticbelowbetadetected
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abstract

A low energy radioactive beam of polarized $^8$Li has been used to observe the vortex lattice near the surface of superconducting NbSe$_2$. The inhomogeneous magnetic field distribution associated with the vortex lattice was measured using depth-resolved $\beta$-detected NMR. Below $T_c$ one observes the characteristic lineshape for a triangular vortex lattice which depends on the magnetic penetration depth and vortex core radius. The size of the vortex core varies strongly with magnetic field. In particular in a low field of 10.8 mT the core radius is much larger than the coherence length. The possible origin of these giant vortices is discussed.

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