Responses of the pseudogap and d-wave superconductivity to high magnetic fields in the underdoped high-Tc superconductor YBa2Cu4O8: An NMR study

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 pseudogap and the superconductivity in the underdoped high-Tc cuprate YBa2Cu4O8 (Tc=74 K) are reported up to 23.2 T based on NMR measurements. Even though 23.2 T reduces Tc by 26%, no effect is seen on the normal-state pseudogap, which persists in the temperature range where the superconductivity is destroyed by the field. For temperatures T≤15 K, the spin Knight shift increases with increasing H and also the H and T variation of the 63Cu nuclear spin-lattice relaxation rate (1/T1) is 1/T1∝TH. A possible explanation for this finding is offered as due to the H-induced quasiparticle states that extend from the d-wave vortex centers with ungapped spectrum.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number14
Publication statusPublished - 1999
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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