Weak-coupling d -wave BCS superconductivity and unpaired electrons in overdoped La2-x Srx Cu O4 single crystals

Yue Wang, Jing Yan, Lei Shan, Hai Hu Wen, Yoichi Tanabe, Tadashi Adachi, Yoji Koike

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43 Citations (Scopus)

Abstract

The low-temperature specific heat (SH) of overdoped La2-x Srx Cu O4 single crystals (0.178≤x≤0.290) has been measured. For the superconducting samples (0.178≤x≤0.238), the derived gap values (without any adjusting parameters) approach closely onto the theoretical prediction Δ0 =2.14 kB Tc for the weak-coupling d -wave BCS superconductivity. In addition, the residual term γ (0) of SH at H=0 increases with x dramatically when beyond x∼0.22, and finally evolves into the value of a complete normal metallic state at higher doping levels, indicating a growing amount of unpaired electrons. We argue that this large γ (0) cannot be simply attributed to the pair breaking induced by the impurity scattering, instead the phase separation is possible.

Original languageEnglish
Article number064512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number6
DOIs
Publication statusPublished - 2007 Aug 10

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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