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Relationship between the superconducting gap and the pseudogap; Temperature-dependent photoemission study of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ and La$$_{2}$$CuO$$_{4.10}$$

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

In the high-${it T$_{rm c}$}$ research, relationship between the pseudogap and the superconducting gap has been an important issue. We have performed a detailed temperature-dependent angle-integrated photoemission study of lightly-doped to heavily-overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ and oxygen-doped La$$_{2}$$CuO$$_{4.10}$$. We found that, while the magnitude of the pseudogap increased with decreasing doping, that of the superconducting gap did not increase. This behavior can be explained if the superconducting gap opens only on the Fermi arc around the node (0,0)-($$pi$$,$$pi$$) whereas the pseudogap opens primarily around ($$pi$$,0).

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Category:Physics, Applied

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