Evolution of optical absorption and superconductivity in Bi-2212 and 2223 oxides intercalated by metal-phthalocyanines. A systematical study as a function of intercalation level

L. Grigoryan, K. Yakushi, C. J. Liu, S. Takano, M. Wakata, H. Yamauchi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Exposure to vapors of the metal-phthalocyanines MPc (M = Zn, Ni, Fe or Pb) brings about a systematical variation of optical and superconducting properties of Bi-2212 and 2223 high-Tc oxides. With increasing level of MPc uptake, the spectral weight is gradually transferred from the low to the high-frequency regions, accompanied by a decrease of Tc, diamagnetic response and magnetic hysteresis. Two different types of evolution patterns were observed: the first was characterized by a sharp change at the lowest level of MPc uptake (Tc, hysteresis), while the second featured a gradual evolution (intensities of the electronic absorption bands, diamagnetism). The heavily intercalated Bi-oxides are brightly colored non-conducting materials with well-resolved vibrational features due to both the intercalated MPc molecules and the host oxides. The above evolution patterns are ascribed to a combination of two mechanisms: the decrease of the charge carrier concentration as a result of electron doping into the host oxide, and the increase of anisotropy of the system due to incorporation of insulating MPc molecular layer between the Bi-O bilayers, thereby reducing the coupling along the c-axis. Hence, the intercalation by MPc is shown to be an effective technique for the electron doping leading to a reduction of the charge carrier concentration in the host oxides, in contrast to the intercalation by iodine which leads to a hole doping and to an increase of the number of charge carriers.

Original languageEnglish
Pages (from-to)153-163
Number of pages11
JournalPhysica C: Superconductivity and its applications
Volume218
Issue number1-2
DOIs
Publication statusPublished - 1993 Dec 1

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Intercalation
Superconductivity
intercalation
Oxides
Light absorption
optical absorption
superconductivity
Metals
Charge carriers
oxides
charge carriers
metals
Doping (additives)
Carrier concentration
hysteresis
Diamagnetism
Magnetic hysteresis
diamagnetism
Electrons
Iodine

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "Exposure to vapors of the metal-phthalocyanines MPc (M = Zn, Ni, Fe or Pb) brings about a systematical variation of optical and superconducting properties of Bi-2212 and 2223 high-Tc oxides. With increasing level of MPc uptake, the spectral weight is gradually transferred from the low to the high-frequency regions, accompanied by a decrease of Tc, diamagnetic response and magnetic hysteresis. Two different types of evolution patterns were observed: the first was characterized by a sharp change at the lowest level of MPc uptake (Tc, hysteresis), while the second featured a gradual evolution (intensities of the electronic absorption bands, diamagnetism). The heavily intercalated Bi-oxides are brightly colored non-conducting materials with well-resolved vibrational features due to both the intercalated MPc molecules and the host oxides. The above evolution patterns are ascribed to a combination of two mechanisms: the decrease of the charge carrier concentration as a result of electron doping into the host oxide, and the increase of anisotropy of the system due to incorporation of insulating MPc molecular layer between the Bi-O bilayers, thereby reducing the coupling along the c-axis. Hence, the intercalation by MPc is shown to be an effective technique for the electron doping leading to a reduction of the charge carrier concentration in the host oxides, in contrast to the intercalation by iodine which leads to a hole doping and to an increase of the number of charge carriers.",
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Evolution of optical absorption and superconductivity in Bi-2212 and 2223 oxides intercalated by metal-phthalocyanines. A systematical study as a function of intercalation level. / Grigoryan, L.; Yakushi, K.; Liu, C. J.; Takano, S.; Wakata, M.; Yamauchi, H.

In: Physica C: Superconductivity and its applications, Vol. 218, No. 1-2, 01.12.1993, p. 153-163.

Research output: Contribution to journalArticle

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AU - Grigoryan, L.

AU - Yakushi, K.

AU - Liu, C. J.

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AU - Wakata, M.

AU - Yamauchi, H.

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