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The magnetic penetration depth $\lambda$ in the mixed state of MgB$_2$ hasbeen determined microscopically from the field distribution around magneticvortices probed by muon spin rotation. Both the temperature and magnetic fielddependence of $\lambda$ strongly suggest the presence of delocalizedquasiparticles around the vortex cores. In particular, the effect of Dopplershift has been clearly observed as a finite gradient of the field dependence of$\lambda$, strongly suggesting an anisotropic order parameter with the regionof a vanishingly small energy gap.Comment: 4 pages, 3 figures included. to be published in J. Phys. Soc. Jp

Quasiparticle Excitations outside the Vortex Cores in MgB2Probed by Muon Spin Rotation

Quasiparticle Excitations outside the Vortex Cores in MgB₂Probed by Muon Spin Rotation