Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-11-30
Phys. Rev. Lett. 103, 037004 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures
Scientific paper
We have investigated the doping and temperature dependences of the pseudogap/superconducting gap in the single-layer cuprate La$_{2-x}$Sr$_x$CuO$_4$ by angle-resolved photoemission spectroscopy. The results clearly exhibit two distinct energy and temperature scales, namely, the gap around ($\pi$,0) of magnitude $\Delta^*$ and the gap around the node characterized by the d-wave order parameter $\Delta_0$, like the double-layer cuprate Bi2212. In comparison with Bi2212 having higher $T_c$'s, $\Delta_0$ is smaller, while $\Delta^*$ and $T^*$ are similar. This result suggests that $\Delta^*$ and $T^*$ are approximately material-independent properties of a single CuO$_2$ plane, in contrast the material-dependent $\Delta_0$, representing the pairing strength.
Ando Yoichi
Eisaki Hiroshi
Fujimori Atsushi
Hashimoto Makoto
Hussain Zahid
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