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Muon spin relaxation and neutron diffraction investigations of quadrupolar and magnetically ordered states of YbRu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Ge<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>
The magnetic- and quadrupolar-ordered states of polycrystalline YbRu${}_{2}$Ge${}_{2}$ have been investigated using zero-field (ZF) muon spin relaxation (\ensuremath{\mu}SR) and neutron diffraction measurements. Specific heat measurements show three successive phase transitions with decreasing temperature from a paramagnetic to a quadrupolar state at T${}_{0}$ \ensuremath{\sim} 10 K, from the quadrupolar to a …