Pseudogap, Superconducting Gap, and Fermi Arcs in Underdoped Cuprate Superconductors

Details Pseudogap, Superconducting Gap, and Fermi Arcs in Underdoped Cuprate Superconductors Pseudogap, Superconducting Gap, and Fermi Arcs in Underdoped Cuprate Superconductors

2005-02-16

arxiv.org/abs/cond-mat/0502377v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, RevTeX4

Scientific paper

Through the measurements of magnetic field dependence of specific heat in $La_{2-x}Sr_xCuO_4$ in zero temperature limit, we find that the nodal slope $v_\Delta$ of the superconducting gap has a very similar doping dependence of the pseudogap temperature $T^*$ or value $\Delta_p$. Meanwhile the maximum quasiparticle gap derived from $v_\Delta$ is quite close to $T^*$. Both indicate a close relationship between the pseudogap and superconductivity. It is also found that $T_c \approx \beta v_\Delta \gamma_n(0)$, where $\gamma_n(0)$ is the extracted zero temperature value of the normal state specific heat coefficient which is proportional to the size of the residual Fermi arc $k_{arc}$. These observations mimic the key predictions of the SU(2) slave boson theory based on the general resonating-valence-bond (RVB) picture.

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