Pseudogap and superconductivity under high magnetic field in underdoped high-Tc cuprate

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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. Even though H=23.2 T reduces Tc by 19 K, no effect is seen on the normal-state pseudogap, which continues in the temperature region where the superconductivity is destroyed by the field. This suggests that the pseudogap is a consequence of strong electron correlation effects. For temperatures T ≤ 15 K, the H-and T-variation of the 63Cu nuclear spin-lattice relaxation rate (1/T1) is 1/T1 α 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.

Original languageEnglish
Pages (from-to)3764-3766
Number of pages3
JournalInternational Journal of Modern Physics B
Issue number29-31
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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