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Magnetic frustration in the disordered pyrochlore Yb(2)GaSbO(7)
J A Hodges1, P Dalmas de Réotier, A Yaouanc
1CEA-Saclay, IRAMIS/SPEC, F-91191 Gif sur Yvette, France.
Magnetic frustration persists in Yb2GaSbO7 despite lattice disorder, with correlated Ytterbium (Yb) moments remaining dynamic down to 0.02 K. This contrasts with its ordered counterpart, Yb2Ti2O7, highlighting the impact of disorder on magnetic behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Pyrochlore oxides like Yb2GaSbO7 feature a geometrically frustrated Yb3+ sublattice.
- Lattice disorder in Yb2GaSbO7 involves non-magnetic Ga3+ and Sb5+ ions, influencing magnetic interactions.
Purpose of the Study:
- To investigate the magnetic properties and spin dynamics of Yb2GaSbO7 at ultra-low temperatures.
- To understand the role of lattice disorder in magnetic frustration and spin fluctuations.
Main Methods:
- Magnetic susceptibility measurements.
- (170)Yb Mössbauer spectroscopy down to 0.03 K.
- Muon spin relaxation (μSR) measurements down to 0.02 K.
Main Results:
- Established the size of Yb3+ magnetic moments and Yb3+-Yb3+ coupling.
- Observed correlated moment fluctuations tilted relative to the [111] axis at low temperatures.
- Found that lattice disorder suppresses the dynamic transition seen in Yb2Ti2O7 but preserves low-temperature spin fluctuations.
Conclusions:
- Magnetic frustration is operative in Yb2GaSbO7 with antiferromagnetic Yb3+-Yb3+ interactions.
- Spin fluctuations remain dynamic down to 0.02 K, with a decreasing fluctuation rate as temperature is lowered.
- Lattice disorder influences the nature of magnetic transitions in Yb-based pyrochlores.
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