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Pseudogap, Superconducting Gap, and Fermi Arcs in Underdoped Cuprate Superconductors | | Hai-Hu Wen
; Lei Shan
; Xiao-Gang Wen
; Yue Wang
; Hong Gao
; Zhi-Yong Liu
; Fang Zhou
; Jiwu Xiong
; Wenxin Ti
; | | Date: |
16 Feb 2005 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Abstract: | 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 $T_c approx eta v_Delta gamma_n(0)$, 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. | | Source: | arXiv, cond-mat/0502377 | | Services: | Forum | Review | PDF | Favorites | |
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