Delocalized Quasiparticles in the Vortex State of an Overdoped High- [Formula presented] Superconductor Probed by [Formula presented] NMR

G. q. Zheng, H. Ozaki, Y. Kitaoka, P. Kuhns, A. P. Reyes, W. G. Moulton

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We report the spin Knight shift ([Formula presented]) and the nuclear spin-lattice relaxation rate ([Formula presented]) in the vortex state as a function of magnetic field ([Formula presented]) up to 28 T in the high- [Formula presented] superconductor [Formula presented] ([Formula presented]). At low temperatures well below [Formula presented], both [Formula presented] and [Formula presented] measured around the middle point between the two nearest vortices (saddle point) increase substantially with increasing field, which indicate that the quasiparticle states with an ungapped spectrum are extended outside the vortex cores in a [Formula presented]-wave superconductor. The density of states (DOS) around the saddle point is found to be [Formula presented], with [Formula presented] and [Formula presented] being the normal-state DOS.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume88
Issue number7
DOIs
Publication statusPublished - Jan 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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