Emergent excitations and long range order in Gd3Al5O12
Gd3Ga5O12 (GGG) is the archetypal frustrated magnet with unusual magnetic short range order that shows no long range order down to the lowest temperatures measured (25 mK). In this work we would like to study the homologous compound, Gd3Al5O12 (GAG), with a frustration index of 13. A recent specific heat study shows a broad maximum around 1~K, analogous that that found in GGG, followed by a sharp peak at T = 0.175~K indicative of long range order, unlike GGG. The diffuse scattering spectrometer D7 will probe the development of short ranged order correlations in GAG below 1~K that should develop into longer ranged correlations below 0.175~K. The comparison between GGG and GAG will determine the importance of the (already ascertained) exchange interactions for the development of short range and longer ranged magnetic order in hyperkagome structures and shed light on the ordered state of GAG below 0.175~K.
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DEEN Pascale Petronella; FLOREA Ovidiu; HENRY Paul; Henrik Jacobsen; KNEE Christopher; LHOTEL Elsa and WILDES Andrew. (2014). Emergent excitations and long range order in Gd3Al5O12. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-795
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