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 language | English |
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Pages (from-to) | 901-903 |
Number of pages | 3 |
Journal | Physica B: Condensed Matter |
Volume | 281-282 |
DOIs | |
Publication status | Published - Jun 1 2000 |
Externally published | Yes |
Event | Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Jpn Duration: Aug 24 1999 → Aug 28 1999 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering