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Magnetism and superconductivity in CeRh_{1-x}Ir_xIn_5 heavy fermion materials

G. D. Morris·R. H. Heffner·J. E. Sonier·D. E. MacLaughlin·O. O. Bernal·G. J. Nieuwenhuys·A. T. Savici·P. G. Pagliuso·J. L. Sarrao
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Abstract

We report on zero-field muon spin relaxation studies of cerium based heavy-fermion materials CeRh_{1-x}Ir_xIn_5. In the superconducting x=0.75 and 1 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. Muon spin realxation 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 muon 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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G. D. Morris, R. H. Heffner, J. E. Sonier, D. E. MacLaughlin, O. O. Bernal, G. J. Nieuwenhuys, A. T. Savici, P. G. Pagliuso, J. L. Sarrao. 2003-01-22. Magnetism and superconductivity in CeRh_{1-x}Ir_xIn_5 heavy fermion materials. https://doi.org/10.1016/s0921-4526(02)01640-x

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