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Field-angle dependent specific heat measurement has been done on theheavy-fermion superconductor CeCoIn5 down to ~ 0.29 K, in a magnetic fieldrotating in the tetragonal c-plane. A clear fourfold angular oscillation isobserved in the specific heat with the minima (maxima) occurring along the[100] ([110]) directions. Oscillation persists down to low fields H << Hc2,thus directly proving the existence of gap nodes. The results indicate that thesuperconducting gap symmetry is most probably of dxy type.Comment: 8 pages, 3 figures, to be published in J. Phys. Condens. Matte

Field-angle dependence of the zero-energy density of states in the unconventional heavy-fermion superconductor CeCoIn5

Field-angle dependence of the zero-energy density of states in the unconventional heavy-fermion superconductor CeCoIn₅