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To identify the superconducting gap symmetry in CeCoIn5 (Tc=2.3 K), weperformed angle-resolved specific heat (C_\phi) measurements in a field rotatedaround the c-axis down to very low temperatures 0.05Tc and detailed theoreticalcalculations. In a field of 1 T, a sign reversal of the fourfold angularoscillation in C_\phi has been observed at T ~ 0.1Tc on entering aquasiclassical regime where the maximum of C_\phi corresponds to the antinodaldirection, coinciding with the angle-resolved density of states (ADOS)calculation. The C_\phi behavior, which exhibits minima along [110] directions,unambiguously allows us to conclude d_{x^2-y^2} symmetry of this system. TheADOS-quasiclassical region is confined to a narrow T and H domain within T/Tc ~0.1 and 1.5 T (0.13Hc2).

Sign reversal of field-angle resolved heat capacity oscillations in a heavy fermion superconductor CeCoIn$_5$ and $d_{x^2-y^2}$ pairing symmetry