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The magnetic and quadrupolar ordered states of polycrystalline YbRu2Ge2 havebeen investigated using zero-field muon spin relaxation ({\mu}SR) and neutrondiffraction measurements. Specific heat measurements show three successivephase transitions, with decreasing temperature from a paramagnetic to aquadrupolar state at T0 ~ 10 K, from the quadrupolar to a magnetic state at T1~ 6.5 K and a possible change in the magnetic ground state at T2 ~ 5.5 K. Clearevidence for the magnetic transition below 7 K (spectrum at 8 K revealsparamagnetic state) and a likely change in the magnetic structure near 5.8 K isobserved in the zero-field {\mu}SR measurements. The {\mu}SR data, however, donot reveal any signature of magnetic order in the temperature range 8 - 45 K.This result is further supported by neutron diffraction measurements, whereclear magnetic Bragg peaks have been observed below 8 K, but not above it.Below 8 K, the magnetic Bragg peaks can be characterized by an incommensurateantiferromagnetic ordering with the propagation vector q = [0.352, 0, 0] andthe magnetic moment 2.9(3) {\mu}B of Yb along the b-axis. These results arediscussed in terms of quadrupolar ordered and magnetically ordered states.

Muon spin relaxation and neutron diffraction investigations of quadrupolar and magnetically ordered states of YbRu2Ge2