Optical study of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O 8+δ single crystal: ab-plane anisotropy

H. L. Liu, M. A. Quijada, D. B. Tanner, H. Berger, G. Margaritondo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report on the ab-plane polarized reflectance of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O 8+δ single crystal over the frequency range from 80 to 32 000 cm-1 (10 meV-4 eV) at temperatures between 10 and 300 K. We find a clear anisotropy in the ab-plane optical conductivity above and below Tc, which is very similar to that formerly published data of Bi2Sr2CaCu2O8 (M.A. Quijada et al., Z. Phys. B 94, 255 (1994)). We employ both the one-component and two-component analyses to the optical data, which suggest that the normal-state infrared anisotropy of (Bi1.57Pb0.43)Sr2CaCu2O 8+δ originates not only from the mass anisotropy, but also from the scattering rate anisotropy. Our results provide evidence that the electronic structures within the CuO2 plane are anisotropic. In the superconducting state, there is a definite ab-plane anisotropy to the far-infrared absorption. This anisotropy could be due either to anisotropy of the superconducting gap or to anisotropy of the mid-infrared component to the conductivity. We also observe the superconducting condensate is anisotropic: The value of the superconducting penetration depth in the a-direction is slightly smaller than that along the b-axis.

Original languageEnglish
Pages (from-to)47-56
Number of pages10
JournalEuropean Physical Journal B
Volume8
Issue number1
DOIs
Publication statusPublished - 1999 Mar 1

Fingerprint

Anisotropy
Single crystals
anisotropy
single crystals
Infrared radiation
Optical conductivity
conductivity
Infrared absorption
infrared absorption
Electronic structure
condensates
penetration
frequency ranges
Scattering
electronic structure
reflectance
scattering

Keywords

  • 74.25.Gz Optical properties
  • 74.72.Hs Bi-based cuprates
  • 78.30.-j Infrared and Raman spectra

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Optical study of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O 8+δ single crystal : ab-plane anisotropy. / Liu, H. L.; Quijada, M. A.; Tanner, D. B.; Berger, H.; Margaritondo, G.

In: European Physical Journal B, Vol. 8, No. 1, 01.03.1999, p. 47-56.

Research output: Contribution to journalArticle

Liu, H. L. ; Quijada, M. A. ; Tanner, D. B. ; Berger, H. ; Margaritondo, G. / Optical study of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O 8+δ single crystal : ab-plane anisotropy. In: European Physical Journal B. 1999 ; Vol. 8, No. 1. pp. 47-56.
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