Doping Dependence of the Pseudogap in La(2-x)Sr(x)CuO(4)
Doping Dependence of the Pseudogap in La(2-x)Sr(x)CuO(4)
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La(2-x)Sr(x)CuO(4)中赝能隙的掺杂依赖性
DOI：
10.1103/physrevb.59.9642
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发表时间：
1998
影响因子：
3.7
通讯作者：
K. Kishio
中科院分区：
文献类型：
--
作者：
J. Naeini;X. K. Chen;J. C. Irwin;M. Okuya;Tatsumi Kimura;K. Kishio
报道了从欠掺杂（x=0.10）到过掺杂（x=0.22）的单晶La 2 Sr x CuO 4的拉曼散射实验结果。的光谱是一致的存在一个强大的各向异性准粒子相互作用，导致在正常状态下耗尽的光谱重量从区域附近的费米表面的区域轴。随着空穴浓度的增加，相互作用的强度迅速降低，当达到最佳掺杂水平时，赝能隙的光谱证据消失。结果表明，赝能隙和超导能隙是由不同的机制产生的。
We report the results of Raman scattering experiments on single crystals of ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ that span the range from underdoped $(x=0.10)$ to overdoped $(x=0.22).$ The spectra are consistent with the existence of a strong anisotropic quasiparticle interaction that results in a normal state depletion of spectral weight from regions of the Fermi surface located near the zone axes. The strength of the interaction decreases rapidly with increasing hole concentration and the spectral evidence for the pseudogap vanishes when the optimum doping level is reached. The results suggest that the pseudogap and superconducting gap arise from different mechanisms.