Optical anisotropy ofBi2Sr2

Jae‐Hun Kim

¹

,

I. Božović

²

,

D. B. Mitzi

³

et al.

Abstract

The Rapid Communications section is intended for the accelerated publication of important new results S. tnce manuscripts submitted to this section are given priority treatment both in the editorial once and in production, authors should exp/at n'in their submittal letter why the work justijies this special handling A.The optical anisotropy of Bi2Sr2CaCu208 in the 0.08-0.5 eV region is investigated by polarized reflectance measurements on single crystals. A very large anisotropy is found in this spectral region. The in-plane reflectance exhibits metallic behavior, while the c-axis reflectance exhibits insulatorlike behavior. This result is consistent with the large anisotropy found in the resistivity of Bi2Sr2CaCu208. Our spectroscopic data suggest that Bi2Sr2CaCu208 is a quasi-two-dimensional metal similar to La2-~Sr Cu04.

Indefinite by Nature: From Ultraviolet to Terahertz

“…As a result, both crystals can be described using an effective model consisting of alternative metal/dielectric layers as shown in Figure 7b. We use a retrieval method to retrieve the anisotropic dielectric constants between the ab-plane and the c-axis by fitting the reflection spectra obtained using Fourier transform infrared spectroscopy (FTIR) on Bi 2 Sr 2 Ca n−1 Cu n O 2n+4+x 63 and Perkin-Elmer 16U spectrometer on GdBa 2 Cu 3 O 7−x 69 to a model for dielectric function. To obtain the permittivity, we use the Drude−Lorentz model with the form 70…”

“…Cuprates are a class of well-studied superconductors with high critical temperature, T c (above the boiling point of liquid nitrogen). − The relationship between the high- T c mechanics and their anisotropic structures was studied extensively. − Usually, the hole band associated with the Cu–O planes results in a high conductance, which makes the cuprate act as a quasi-two-dimensional conductor. − However, there are still some differences among different cuprates. Below, we analyze in detail electronic structures of four main cuprate superconductors, YBa 2 Cu 3 O 7– x , GdBa 2 Cu 3 O 7– x , La 2– x Sr x CuO 4 , and Bi 2 Sr 2 Ca n –1 Cu n O 2 n +4+ x , and reveal the indefinite dielectric properties in these materials.…”

“…As a result, both crystals can be described using an effective model consisting of alternative metal/dielectric layers as shown in Figure b. We use a retrieval method to retrieve the anisotropic dielectric constants between the ab -plane and the c -axis by fitting the reflection spectra obtained using Fourier transform infrared spectroscopy (FTIR) on Bi 2 Sr 2 Ca n –1 Cu n O 2 n +4+ x and Perkin-Elmer 16U spectrometer on GdBa 2 Cu 3 O 7– x to a model for dielectric function. To obtain the permittivity, we use the Drude–Lorentz model with the form ε ( ω ) = ε ∞ − ω p 2 ω 2 + iΓ ω + prefix∑ n A n 2 ω n 2 − ω 2 − i Γ n ω where ε ∞ is the relativity permittivity as ω goes to infinity and the second term on the right-hand side is the usual Drude term with plasma frequency ω p and damping frequency Γ.…”

Far-infraredc-axis response ofLa1.87SrHenn1, Kircher2, Cardona3 et al. 1996Phys. Rev. B140102View full textAdd to dashboardCite

“…[2][3][4][5][6][7][8][9] However several cuprates, La 2Ϫx Sr x CuO 4 (xϭ 0.1, 0. 13 4 -7 show, as a common feature, an edge structure in the far-infrared reflectivity, which appears only in the superconducting state.…”