PSEUDOGAP AND SUPERCONDUCTIVITY UNDER HIGH MAGNETIC FIELD IN UNDERDOPED HIGH-Tc CUPRATE

Autor:	W. G. Moulton, Yasuo Kitaoka, W. G. Clark, Y. Kodama, G.-q. Zheng, Kunisuke Asayama, Philip L. Kuhns
Rok vydání:	1999
Předmět:	Physics Superconductivity Electronic correlation Condensed matter physics Electrical resistivity and conductivity Transition temperature Quasiparticle Statistical and Nonlinear Physics Knight shift Cuprate Condensed Matter Physics Pseudogap
Zdroj:	International Journal of Modern Physics B. 13:3764-3766
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s021797929900388x
Popis:	The responses to the magnetic field (H) of the superconductivity and the pseudogap in the underdoped high- T c cuprate YBa 2 Cu 4 O 8(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 63 Cu 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ef54d2571652626ce32a1fcfa5dad6a4 https://doi.org/10.1142/s021797929900388x Zobrazit plný text záznamu