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Distinct doping dependences of the pseudogap and superconducting gap of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ cuprate superconductors

Hashimoto, Makoto*; Yoshida, Teppei*; Tanaka, Kiyohisa*; Fujimori, Atsushi*; Okusawa, Makoto*; Wakimoto, Shuichi ; Yamada, Kazuyoshi*; Kakeshita, Teruhisa*; Eisaki, Hiroshi*; Uchida, Shinichi*

We have performed a temperature-dependent angle-integrated photoemission study of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ covering from lightly doped to heavily overdoped regions and oxygen -doped La$$_{2}$$CuO$$_{4.10}$$. The superconducting gap energy $$Delta_{sc}$$ was found to remain small for decreasing hole concentration while the pseudogap energy $$Delta^{*}$$ and temperature $$T^{*}$$ increase. The different behaviors of the superconducting gap and the pseudogap can be explained if the superconducting gap opens only on the Fermi arc around the nodal (0,0)-$$(pi,pi)$$ direction while the pseudogap opens around $$sim (pi,0)$$. The results suggest that the pseudogap and the superconducting gap have different microscopic origins.

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Category:Materials Science, Multidisciplinary

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