ab-plane optical properties of Ni-doped Bi2Sr2CaCu2O8+δ

Hsiang Lin Liu, D. B. Tanner, H. Berger, G. Margaritondo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The ab-plane optical reflectance of single crystal of Bi2Sr2Ca(Cu1-xNix)2O 8+δ, for x=0.0215, has been measured from 80 to 40000 cm-1 (10 meV-5 eV) and at temperatures between 20 and 300 K. Through Ni substitution, the optical conductivity shows a broad peak at about 400 cm-1, which grows in intensity and shifts to lower frequency as the temperature is reduced. We suggest that this peculiar low-frequency feature is associated with the significant disorder induced by Ni impurities. Analysis of the conductivity within the framework of the two-component and the one-component pictures indicates that the main effect of Ni substitution is to increase impurity scattering rate. There is no evidence of a rapid drop in the free carrier scattering rate near Tc. An estimate of the low-frequency spectral weight shows that Ni reduces the carrier density in the CuO2 plane: each Ni removes one carrier. Below Tc, a sum-rule evaluation finds the superconducting condensate contains about a fifth of the total doping-induced, or two thirds of the free-carrier oscillator strength in the normal state. The strength of the condensate is horizontally offset from the Uemura line, with a smaller superfluid density than implied by Tc. This decreased superfluid density in the CuO2 plane could be connected with the effect of impurity-induced disorder.

Original languageEnglish
Pages (from-to)197-210
Number of pages14
JournalPhysica C: Superconductivity and its applications
Volume311
Issue number3-4
DOIs
Publication statusPublished - 1999 Jan 1

Fingerprint

Optical properties
Impurities
low frequencies
optical properties
impurities
condensates
Substitution reactions
disorders
Scattering
substitutes
Optical conductivity
conductivity
scattering
oscillator strengths
sum rules
Carrier concentration
Doping (additives)
Single crystals
reflectance
Temperature

Keywords

  • Infrared spectroscopy
  • Optical reflectivity
  • Superconductor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

ab-plane optical properties of Ni-doped Bi2Sr2CaCu2O8+δ. / Liu, Hsiang Lin; Tanner, D. B.; Berger, H.; Margaritondo, G.

In: Physica C: Superconductivity and its applications, Vol. 311, No. 3-4, 01.01.1999, p. 197-210.

Research output: Contribution to journalArticle

Liu, Hsiang Lin ; Tanner, D. B. ; Berger, H. ; Margaritondo, G. / ab-plane optical properties of Ni-doped Bi2Sr2CaCu2O8+δ. In: Physica C: Superconductivity and its applications. 1999 ; Vol. 311, No. 3-4. pp. 197-210.
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