Quantum fluctuations on a hyperkagome lattice
In this proposal we intend to study the rare earth garnet Yb3Ga5O12 (YbGG) which is isostructural to the canonical frustrated compound Gd3Ga5O12 (GGG). In YbGG the Yb3+ ions are positioned on two interpenetrating hyperkagome sublattices and provide an effective quantum spin S = 1/2. Magnetisation measurements determine antiferromagnetic exchange interactions with a Curie-Weiss temperature θCW = -118K and no indication of long rang order down to TN = 54 mK [3]. This makes YbGG one of the most frustrated compounds known to date with a frustration index of θCW / TN = 2000. In contrast, GGG has a frustration index of ~14. The aim of the study is to determine the magnetic correlations in the short ranged ordered phase of YbGG.
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DEEN Pascale Petronella; Richard Edberg; FJELLVAG Ingrid Marie; LEFMANN Kim; MANGIN-THRO Lucile and Lise Ørduk Sandberg. (2018). Quantum fluctuations on a hyperkagome lattice. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-274
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