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

Abstract

The magnetic and quadrupolar ordered states of polycrystalline YbRu2Ge2 have been investigated using zero-field muon spin relaxation (μSR) and neutron diffraction measurements. Specific heat measurements show three successive phase transitions, with decreasing temperature from a paramagnetic to a quadrupolar 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. Clear evidence for the magnetic transition below 7 K (spectrum at 8 K reveals paramagnetic state) and a likely change in the magnetic structure near 5.8 K is observed in the zero-field μSR measurements. The μSR data, however, do not reveal any signature of magnetic order in the temperature range 8 - 45 K. This result is further supported by neutron diffraction measurements, where clear 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 incommensurate antiferromagnetic ordering with the propagation vector q = [0.352, 0, 0] and the magnetic moment 2.9(3) μB of Yb along the b-axis. These results are discussed in terms of quadrupolar ordered and magnetically ordered states.

arXiv comment16 pages, 8 figures, PRB-accepted-2011

References in corpus (5)

• Triple-q octupolar ordering in NpO_2
• Direct Observation of Antiferro-Quadrupolar Ordering - Resonant X-ray Scattering Study of DyB2C2
• Observation of Modulated Quadrupolar Structures in PrPb3
• Quasiquartet CEF ground state with possible quadrupolar ordering in the tetragonal compound YbRu${}_2$Ge${}_2$
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• Persistent spin dynamics in magnetically ordered honeycomb cobalt oxides
• Lattice dynamics, crystal-field excitations and quadrupolar fluctuations of YbRu${}_2$Ge${}_2$
• Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission
• Heavy quasiparticle bands in the underscreened quasiquartet Kondo lattice
• Optical and magnetic excitations in the underscreened quasi-quartet Kondo lattice
• Divergence of the quadrupole-strain susceptibility of YbRu${}_2$Ge${}_2$; a local moment realization of electronic nematicity