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Weak-coupling<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave BCS superconductivity and unpaired electrons in overdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="…
The low-temperature specific heat (SH) of overdoped ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ single crystals $(0.178\ensuremath{\leqslant}x\ensuremath{\leqslant}0.290)$ has been measured. For the superconducting samples $(0.178\ensuremath{\leqslant}x\ensuremath{\leqslant}0.238)$, the derived gap values (without any adjusting parameters) approach closely onto the theoretical prediction ${\ensuremath{\Delta}}_{0}=2.14{k}_{B}{T}_{c}$ for the weak-coupling $d$-wave BCS superconductivity. In addition, the residual term $\ensuremath{\gamma}(0)$ of SH at $H=0$ …