Quasiparticle excitations outside the vortex cores in MgB 2 probed by muon spin rotation

Kazuki Ohishi, Takahiro Muranaka, Jun Akimitsu, Akihiro Koda, Wataru Higemoto, Ryosuke Kadono

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


The magnetic penetration depth λ in the mixed state of MgB 2 has been determined microscopically from the field distribution around magnetic vortices probed by muon spin rotation. Both the temperature and magnetic field dependence of λ strongly suggest the presence of delocalized quasiparticles around the vortex cores. In particular, the effect of Doppler shift has been clearly observed as a finite gradient of the field dependence of λ, strongly suggesting an anisotropic order parameter with the region of a vanishingly small energy gap.

Original languageEnglish
Pages (from-to)29-32
Number of pages4
Journaljournal of the physical society of japan
Issue number1
Publication statusPublished - Jan 2003
Externally publishedYes


  • Flux-line lattice state
  • MgB
  • Penetration depth
  • μSR

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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