Evidence for a pseudogap in underdoped $Bi_2Sr_2CaCu_2O_{8+δ}$ and $YBa_2Cu_3O_{6.50}$ from in-plane optical conductivity measurements

J. Hwang; J. P. Carbotte; T. Timusk

doi:10.1103/PhysRevLett.100.177005

paper

Evidence for a pseudogap in underdoped $B i_{2} S r_{2} C a C u_{2} O_{8 + δ}$ and $Y B a_{2} C u_{3} O_{6.50}$ from in-plane optical conductivity measurements

arXiv:0804.2286 · doi:10.1103/PhysRevLett.100.177005

Abstract

The real part of the in-plane optical self-energy data in underdoped Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ (Bi-2212) and ortho II YBa $_{2}$ Cu $_{3}$ O $_{6.5}$ contains new and important information on the pseudogap. Using a theoretical model approach we find that the density of state lost below the pseudogap $Δ_{p g}$ is accompanied with a pileup just above this energy. The pileup along with a sharp mode in the bosonic spectral function leads to an unusually rapid increase in the optical scattering rate and a characteristically sloped peak in the real part of the optical self-energy. These features are not found in optimally doped and overdoped samples and represent a clearest signature so far of the opening of a pseudogap in the in-plane optical conductivity.

4 pages, 3 figures. To appear in Phys. Rev. Lett

Evidence for a pseudogap in underdoped $B i_{2} S r_{2} C a C u_{2} O_{8 + δ}$ and $Y B a_{2} C u_{3} O_{6.50}$ from in-plane optical conductivity measurements

Abstract

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Evidence for a pseudogap in underdoped Bi2​Sr2​CaCu2​O8+δ​ and YBa2​Cu3​O6.50​ from in-plane optical conductivity measurements

Abstract

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Evidence for a pseudogap in underdoped $B i_{2} S r_{2} C a C u_{2} O_{8 + δ}$ and $Y B a_{2} C u_{3} O_{6.50}$ from in-plane optical conductivity measurements