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
DOI 10.1103/PhysRevB.60.R9947 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | Pressure unresolved | onset |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 55 | Pressure not reported | onset |
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