Exploring microeV dynamics in Gadolinium Gallium Garnet
Gd3Ga5O12 (GGG) is the archetypal frustrated magnet with a hyperkagome structure of interconnected triangles of Gd3+ ions. Frustration prevents GGG from exhibiting long range order down to 25 mK despite a Curie-Weiss temperature of -2.8 K Using neutron powder diffraction, Petrenko et al. have shown that short range magnetic order gradually builds up in GGG as the temperature is decreased below ~3 K. The short range magnetic order is expected to organize itself in weakly interacting antiferromagnetic loops that remain dynamic down to the lowest temperatures. These dynamics have been measured with Mössbauer spectroscopy and with muons, showing that the dynamics persists down to the lowest temperatures. These techniques do not provide insight into the dispersion of these excitations. Neutron scattering measurements on a backscattering spectrometer such as IN16b, allows us to probe the dispersion of the low lying excitation to determine their origin from soft modes, concomitant with the weakly interacting antiferromagnetic loops, or otherwise.
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DEEN Pascale Petronella; Bernhard Frick; Henrik Jacobsen and SEYDEL Tilo. (2014). Exploring microeV dynamics in Gadolinium Gallium Garnet. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-03-1704
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