d-Wave vortex and pseudogap in underdoped high-Tc cuprate YBa2Cu4O8: High-magnetic-field NMR

Guo-Qing Zheng, W. G. Clark, Y. Kitaoka, K. Asayama, Y. Kodama, P. Kuhns, W. G. Moulton

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Abstract

The responses to the magnetic field (H) of the superconductivity and the pseudogap in the underdoped high-Tc cuprate YBa2Cu4O8 (Tc = 74 K) are reported up to 23.2 T based on NMR measurements. For temperatures T≤15 K, the H and T-variation of the 63Cu nuclear spin-lattice relaxation rate (1/T1) is 1/T1∝TH and also the Knight shift increases with increasing H. We interpret our results as evidence for H-induced quasiparticle states that extend from the d-wave vortex centers with an ungapped spectrum. Even though H = 23.2 T reduces Tc by 19 K, no effect is seen on the normal-state pseudogap which persists in the temperature region where the superconductivity is destroyed by the field, suggesting that it is a consequence of strong electron correlations.

Original languageEnglish
Pages (from-to)901-903
Number of pages3
JournalPhysica B: Condensed Matter
Volume281-282
DOIs
Publication statusPublished - Jun 1 2000
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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