Effect of quasiparticle delocalization on measurements of a multiband superconductor in the vortex state

✍ Scribed by F.D. Callaghan; M. Laulajainen; C.V. Kaiser; J.E. Sonier

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 271 KB
• Volume: 374-375
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2005.11.053

✦ Synopsis

We present mSR measurements of the low temperature magnetic field dependence of the vortex core size in the multiband superconductor NbSe 2 . The spatially extended bound core states associated with the smaller energy gap rapidly delocalize with increasing magnetic field, resulting in a shrinking of the vortex core size. The more tightly bound core states associated with the larger energy gap, on the other hand, lead to a field-independent core size for fields greater than 4 kOe. The field dependence of the extracted magnetic penetration depth is explained in terms of the effect of delocalized quasiparticles on the spatial field variation around the vortex cores.