Cu0.5K0.25Tl0.25Ba2Ca 3Cu4O12-δ superconductor and its dielectric properties

Adnan Younis, Nawazish Ali Khan

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Cu0.5K0.25Tl0.25Ba2Ca 3Cu4O12-δ superconductor samples were synthesized and their dielectric properties were measured between 80 K and 290 K by means of capacitance (C) and conductance (G) measurements with the test frequency (f) in the range of 10 KHz to 4 MHz. A negative capacitance (NC) occurrence was observed, which most likely arose from the superior Fermi level of ceramic superconductor samples than metal electrodes. Also the NC may be due to the space charge situated at the multiple insulatorsuperconductor interfaces (grain boundaries) in the materials. The negative dielectric constant (ε′) and loss factor (tan δ) show strong dispersion at low frequencies. The lower thermal agitation at 80 K may boost the polarizability and hence the dielectric constants (ε′ and ε″).

Original languageEnglish
Pages (from-to)3097-3107
Number of pages11
JournalModern Physics Letters B
Issue number32
Publication statusPublished - Dec 30 2010
Externally publishedYes


  • capacitance
  • conductance
  • CuKTlBaCa CuO superconductors
  • dielectric constant
  • polarization

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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