Pseudogap ground state and its doping evolution in Bi 2Sr 2-xLa xCuO 6+δ: Removing the superconducting state by the application of very high magnetic fields

Guo Qing Zheng; S. Kawasaki; C. T. Lin; P. L. Kuhns; A. P. Reyes

doi:10.1007/s10948-012-1575-4

Pseudogap ground state and its doping evolution in Bi ₂Sr _2-xLa _xCuO _6+δ: Removing the superconducting state by the application of very high magnetic fields

Guo Qing Zheng, S. Kawasaki, C. T. Lin, P. L. Kuhns, A. P. Reyes

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We present results for the pseudogap ground state and its doping evolution in single-layered copper-oxide Bi ₂Sr _2-xLa _xCuO _6+δ. We apply very high magnetic fields up to 44 T to remove the superconducting state and reveal the hidden low temperature (T ) normal state. Through 63Cu- NMR Knight shift and spin-lattice relaxation rate measurements, we find that there remains a finite density of states (DOS) at the Fermi level in the zero-T limit when the superconductivity is removed, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual DOS in the pseudogap ground state decreases with decreasing doping (increasing x), but remains quite large even at the vicinity of the magnetically ordered phase of x ≥ 0.8. The result indicates that the superconductivity emerges from the remaining Fermi surface and coexists with the pseudogap.

Original language	English
Pages (from-to)	1249-1253
Number of pages	5
Journal	Journal of Superconductivity and Novel Magnetism
Volume	25
Issue number	5
DOIs	https://doi.org/10.1007/s10948-012-1575-4
Publication status	Published - Jul 2012

Keywords

High magnetic field
Pseudogap
Superconductivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Pseudogap ground state and its doping evolution in Bi ₂Sr _2-xLa _xCuO _6+δ : Removing the superconducting state by the application of very high magnetic fields. / Zheng, Guo Qing ; Kawasaki, S.; Lin, C. T.; Kuhns, P. L.; Reyes, A. P.

In: Journal of Superconductivity and Novel Magnetism, Vol. 25, No. 5, 07.2012, p. 1249-1253.

Research output: Contribution to journal › Article › peer-review

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abstract = "We present results for the pseudogap ground state and its doping evolution in single-layered copper-oxide Bi 2Sr 2-xLa xCuO 6+δ. We apply very high magnetic fields up to 44 T to remove the superconducting state and reveal the hidden low temperature (T ) normal state. Through 63Cu- NMR Knight shift and spin-lattice relaxation rate measurements, we find that there remains a finite density of states (DOS) at the Fermi level in the zero-T limit when the superconductivity is removed, which indicates that the pseudogap ground state is a metallic state with a finite volume of Fermi surface. The residual DOS in the pseudogap ground state decreases with decreasing doping (increasing x), but remains quite large even at the vicinity of the magnetically ordered phase of x ≥ 0.8. The result indicates that the superconductivity emerges from the remaining Fermi surface and coexists with the pseudogap.",

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