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We use heat capacity measurements as a function of field rotation to identifythe nodal gap structure of CeIrIn5 at pressures to 2.05 GPa, deep inside itssuperconducting dome. A four-fold oscillation in the heat capacity at 0.3 K isobserved for all pressures but with its sign reversed between 1.50 and 0.90GPa. On the basis of recent theoretical models for the field-angle dependentspecific heat, all data, including the sign reversal, imply a d{x^2-y^2} orderparameter with nodes along [110], which constrains theoretical models of thepairing mechanism in CeIrIn5.

physical review letters

Heat-Capacity Measurements of Energy-Gap Nodes of the Heavy-Fermion  Superconductor CeIrIn5 Deep inside the Pressure-Dependent Dome Structure of  its Superconducting Phase Diagram