Metallic behavior of lightly doped La2-xSrxCuO4 with a Fermi surface forming an arc -: art. no. 027001
Metallic behavior of lightly doped La2-xSrxCuO4 with a Fermi surface forming an arc -: art. no. 027001
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DOI：
10.1103/physrevlett.91.027001
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发表时间：
2003-07-11
影响因子：
8.6
通讯作者：
Uchida, S
中科院分区：
文献类型：
--
作者：
Yoshida, T;Zhou, XJ;Uchida, S
用角分辨光电子能谱研究了轻掺杂La_（2-x）Sr_xCuO_4在所谓的“绝缘”自旋玻璃相中的行为。我们观察到在d波超导带隙的节点方向上有一个“准粒子”（quasiparticle，QP）峰穿过费米能级，形成费米面的“弧”，这解释了轻掺杂材料在高温下的金属行为。弧的QP谱权重随着空穴掺杂而平滑地增加，这归因于欠掺杂区和轻掺杂区载流子数的nsimilar tox行为。
Lightly doped La2-xSrxCuO4 in the so-called "insulating" spin-glass phase has been studied by angle-resolved photoemission spectroscopy. We have observed that a "quasiparticle" (QP) peak crosses the Fermi level in the node direction of the d-wave superconducting gap, forming an "arc" of Fermi surface, which explains the metallic behavior at high temperatures of the lightly doped materials. The QP spectral weight of the arc smoothly increases with hole doping, which we attribute to the nsimilar tox behavior of the carrier number in the underdoped and lightly doped regions.