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The low-temperature specific heat (SH) of overdoped La_{2-x}Sr_{x}CuO_{4}single crystals (0.178=<x=<0.290) has been measured. For the superconductingsamples (0.178=<x=<0.238), the derived gap values (without any adjustingparameters) approach closely onto the theoretical prediction\Delta_{0}=2.14k_{B}T_{c} for the weak-coupling d-wave BCS superconductivity.In addition, the residual term \gamma(0) of SH at H=0 increases with xdramatically when beyond x~0.22, and finally evolves into the value of acomplete normal metallic state at higher doping levels, indicating growingamount of unpaired electrons. We argue that this large \gamma(0) cannot besimply attributed to the pair breaking induced by the impurity scattering,instead the phase separation is possible.Comment: 6 pages, 6 figures; Contents added; Accepted for publication in Phys.  Rev.

physical review. b, condensed matter and materials physics

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="…

Weak-couplingd-wave BCS superconductivity and unpaired electrons in overdopedLa2−xSrx