Abstract
We report zero-field-μSR studies of cerium-based heavy-fermion materials CeRh 1− x Ir x In 5. In the superconducting x=0.75 and 1.0 compositions, muon spin relaxation functions were found to be temperature independent across T c; no evidence for the presence of electronic magnetic moments was observed. The x=0.5 material is antiferromagnetic below T N =3.75 K and superconducting below T c =0.8 K . μSR spectra show the gradual onset of damped coherent oscillations characteristic of magnetic order below T N. At 1.65 K the total oscillating amplitude accounts for at least 85% of the sample volume. No change in precession frequency or amplitude is detected on cooling below T c, indicating the microscopic coexistence of magnetism and superconductivity in this material.
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