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Anisotropic intermediate coupling superconductivity in Cu(0.03)TaS(2).

Xiangde Zhu1, Yuping Sun, Shuhua Zhang

  • 1Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 10, 2011
PubMed
Summary
This summary is machine-generated.

Copper intercalation in TaS2 creates an anisotropic type-II superconductor, Cu(0.03)TaS(2), with a critical temperature of 4.03 K. Superconductivity is explained by intermediate coupling BCS theory, enhanced by increased carrier density.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Investigating anisotropic superconducting properties in intercalated transition metal dichalcogenides.
  • Understanding the role of intercalation on electronic structure and superconducting mechanisms.

Purpose of the Study:

  • To characterize the superconducting state of Cu(0.03)TaS(2).
  • To determine the type of superconductor and elucidate the underlying superconductivity mechanism.
  • To explore the impact of copper intercalation on the electronic properties and superconducting transition temperature (T(C)) of 2H-TaS(2).

Main Methods:

  • Experimental investigations using magnetization, magnetoresistance, and specific heat measurements.
  • Analysis of superconducting parameters including critical temperature (T(C)), specific heat jump (ΔC/γ(n)T(C)), and gap ratio (2Δ/k(B)T(C)).
  • First-principles electronic structure calculations.

Main Results:

  • Cu(0.03)TaS(2) exhibits superconductivity with a critical temperature (T(C)) of 4.03 K.
  • The material is identified as an anisotropic type-II superconductor.
  • Superconducting parameters are consistent with the intermediate coupling BCS scenario (λ∼0.68).
  • Electronic structure calculations reveal increased Fermi surface volume and carrier density due to copper intercalation, suppressing charge density wave (CDW) fluctuations and enhancing T(C).

Conclusions:

  • The superconductivity in Cu(0.03)TaS(2) is well-described by the intermediate coupling BCS theory.
  • Copper intercalation significantly modifies the electronic structure, leading to enhanced superconductivity in 2H-TaS(2).
  • The findings highlight the potential of intercalation as a strategy to tune superconducting properties in layered materials.