Effects of high magnetic fields on the pseudogap and d-wave superconductivity in the underdoped and overdoped high-Tc superconductors

Guo Qing Zheng, H. Ozaki, W. G. Clark, M. Sakai, Y. Kitaoka, Y. Kodama, T. Kondo, Y. Shimakawa, Y. Kubo, P. Kuhns, A. P. Reyes, W. G. Moulton

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Abstract

Based on measurements of the 63Cu Knight shift and the nuclear spin-lattice relaxation rate under magnetic fields up to 28 T, we find that the pseudogap in the slightly overdoped TlSr2CaCu2O6.88 (Tc=68 K) is due to Cooper pair density fluctuations. Such fluctuations are also found in the underdoped YBa2Cu4O8 (Tc=74 K), but are small and only survive up to Tsf ≃ Tc+15K=90 K, which is much lower than the field-independent pseudogap temperature T* ≃ 160 K. The implication on the phase diagram is discussed. At low temperatures in the superconducting state, a field-induced finite density of states was found in both compounds and is interpreted as due to the quasiparticles outside a vortex core in a d-wave superconductor.

Original languageEnglish
Pages (from-to)819-822
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume341-348
Issue numberPART 3
DOIs
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Zheng, G. Q., Ozaki, H., Clark, W. G., Sakai, M., Kitaoka, Y., Kodama, Y., Kondo, T., Shimakawa, Y., Kubo, Y., Kuhns, P., Reyes, A. P., & Moulton, W. G. (2000). Effects of high magnetic fields on the pseudogap and d-wave superconductivity in the underdoped and overdoped high-Tc superconductors. Physica C: Superconductivity and its applications, 341-348(PART 3), 819-822. https://doi.org/10.1016/S0921-4534(00)00703-6