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Crossover from coherent quasiparticles to incoherent hole carriers in underdoped cuprates

銅酸化物超伝導体の低濃度領域におけるコヒーレント準粒子状態からインコヒーレントなホール状態への変化

橋本 信*; 吉田 鉄平*; 田中 清尚*; 藤森 淳*; 奥沢 誠*; 脇本 秀一 ; 山田 和芳*; 掛下 照久*; 永崎 洋*; 内田 慎一*

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

In underdoped cuprates, only a portion of the Fermi surface survives as Fermi arcs due to pseudogap opening. In hole-doped La$$_{2}$$CuO$$_{4}$$, we have deduced the "coherence temperature" $$T_{coh}$$ of quasiparticles on the Fermi arc above which the broadened leading edge position in angle-integrated photoemission spectra is shifted away from the Fermi level and the quasiparticle concept starts to lose its meaning. $$T_{coh}$$ is found to rapidly increase with hole doping, an opposite behavior to the pseudogap temperature $$T^{*}$$. The superconducting dome is thus located below both $$T^{*}$$ and $$T_{coh}$$, indicating that the superconductivity emerges out of the coherent Fermionic quasiparticles on the Fermi arc. $$T_{coh}$$ remains small in the underdoped region, indicating that incoherent charge carriers originating from the Fermi arc are responsible for the apparently metallic transport at high temperatures.

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パーセンタイル:52.72

分野:Materials Science, Multidisciplinary

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