Physics – Condensed Matter – Superconductivity
Scientific paper
2011-09-02
PhysRevB.85.134519 2012
Physics
Condensed Matter
Superconductivity
The final version in PRB
Scientific paper
10.1103/PhysRevB.85.134519
Based on the NMR measurements on Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ (La-Bi2201) in strong magnetic fields, we identify the non-superconducting pseudogap phase in the cuprates as a Luttinger-volume violating Fermi liquid (LvvFL). This state is a zero temperature quantum liquid that does not break translational symmetry, and yet, the Fermi surface encloses a volume smaller than the large one given by the Luttinger theorem. The particle number enclosed by the small Fermi surface in the LvvFL equals the doping level $p$, not the total electron number $n_e=1-p$. Both the phase string theory and the dopon theory are introduced to describe the LvvFL. For the dopon theory, we can obtain a semi-quantitative agreement with the NMR experiments.
Kawasaki Shinji
Mei Jia-Wei
Wen Xiao Gang
Weng Zheng-Yu
Zheng Guo-qing
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