ZERO-FIELD MU-SR STUDY OF ANTIFERROMAGNETIC CE(RU1-XRHX)(2)SI-2 HEAVY-FERMION COMPOUND

Zero-field mu SR measurements have been carried out on high-quality si ngle-crystal samples of the antiferromagnetic heavy-fermion compound C e(Ru1-xRhx)(2)Si-2 for x = 0.15 from 2 K to 300 K. The mu SR signal wi th the muon beam parallel to the c-axis does not show any definite cha nge in its time spectrum. The mu SR signal perpendicular to the c-axis indicates appearance of the spin relaxation at about 6 K with a rapid increase of its rate as a decrease of temperature. This is interprete d in terms of occurrence of inhomogeneous static fields along the c-ax is due to incommensurable sinusoidal spin ordering along the c-axis. T he held distribution deduced from the mu SR time spectrum is consisten t with an SDW ordering.