Characteristic transport properties observed in underdoped YBa2Cu3O6+x

Kouichi Semba, Masashi Mukaida, Azusa Matsuda

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

By annealing under the equilibrium oxygen pressure, we have succeeded in obtaining YBa2Cu3O6+x with any doping level. Both in bulk and film samples, the doping driven superconductor-to-insulator (S-I) transition has been observed at ρab≃0.8 mΩ cm which corresponds to the universal resistance h/4e2 per CuO2 bi-layer. The observed critical carrier density is nH SI≃3 × 1020 cm-3. Within the critical region of the S-I transition, using a thin film sample, we have succeeded in observing the resistivity scaling as a function of doping. The carrier density obeys the relation nH ∝x - 0.2 in the underdoped region (0.2≤x< 0.5), where the conductivity is substantially small and transport properties show weaker temperature dependence. The quantum effects are considered to be more important e.g., the quantum phase fluctuation in superconductors with small superfluid density.

Original languageEnglish
Pages (from-to)74-76
Number of pages3
JournalPhysica B: Condensed Matter
Volume312-313
DOIs
Publication statusPublished - 2002 Mar
Externally publishedYes

Fingerprint

Transport properties
Superconducting materials
transport properties
Doping (additives)
Carrier concentration
insulators
Annealing
Oxygen
scaling
Thin films
conductivity
temperature dependence
electrical resistivity
annealing
oxygen
thin films
Temperature

Keywords

  • Metal-insulator transition
  • Quantum critical point
  • YBCO

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Characteristic transport properties observed in underdoped YBa2Cu3O6+x . / Semba, Kouichi; Mukaida, Masashi; Matsuda, Azusa.

In: Physica B: Condensed Matter, Vol. 312-313, 03.2002, p. 74-76.

Research output: Contribution to journalArticle

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