Low temperature spin fluctuations in geometrically frustrated Yb3Ga5O12

Abstract

In the garnet structure compound Yb3Ga5O12, the Yb3+ ions (ground state effective spin S' = 1/2) are situated on two interpenetrating corner sharing triangular sublattices such that frustrated magnetic interactions are possible. Previous specific heat measurements evidenced the development of short range magnetic correlations below 0.5K and a lambda-transition at 54mK (Filippi et al. J. Phys. C: Solid State Physics 13 (1980) 1277). From 170-Yb M"ossbauer spectroscopy measurements down to 36mK, we find there is no static magnetic order at temperatures below that of the lambda-transition. Below 0.3K, the fluctuation frequency of the short range correlated Yb3+ moments progressively slows down and as the temperature tends to 0, the frequency tends to a quasi-saturated value of 3 x 10^9 s^-1. We also examined the Yb3+ paramagnetic relaxation rates up to 300K using 172-Yb perturbed angular correlation measurements: they evidence phonon driven processes.

6 pages, 5 figures

References in corpus (5)

• Properties of a classical spin liquid: the Heisenberg pyrochlore antiferromagnet
• Low-temperature properties of classical, geometrically frustrated antiferromagnets
• Transition to Long Range Magnetic Order in the Highly Frustrated Insulating Pyrochlore Antiferromagnet Gd_2Ti_2O_7
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Cited by in corpus (5)

• Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials
• Crystal fields and magnetic structure of the Ising antiferromagnet Er${}_3$Ga${}_5$O${}_{12}$
• Emergent magnetic behaviour in the frustrated Yb${}_3$Ga${}_5$O${}_{12}$ garnet
• Spin dynamics of the quantum dipolar magnet Yb${}_3$Ga${}_5$O${}_{12}$ in an external field
• Uncommon magnetic ordering in the quantum magnet Yb${}_3$Ga${}_5$O${}_{12}$