Evidence for line nodes in the energy gap for (La1.85Sr0.15)CuO4 from low-temperature specific-heat measurements

The dependence of the low-temperature specific heat of (La1.85Sr0.15)CuO4 o n magnetic field (H) is reported. Low concentrations of paramagnetic center s allow a different approach to analysis of the data that minimizes the pro blem of identifying the effects of the line nodes in the energy gap that ar e expected for d-wave pairing. As a consequence, these effects can be recog nized even in the raw data. The data show evidence of the T-2 term expected for H=0, and a well defined (HT)-T-1/2 term for H not equal 0. They confor m to a scaling relation recently predicted for d-wave pairing.