Low-temperature thermal expansion of γ-irradiated ruby
journal contributionposted on 03.05.2006 by Ian J. Brown, M.A. Brown
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Measurements of the low-temperature thermal expansion of γ-irradiated rubies have been made with use of a three-terminal capacitance dilatometer. The data exhibit a positive Schottky-type anomaly at ∼3.9 K, not present in the data obtained for a pure Al2O3 sample, and this contribution to the thermal expansion has been tentatively attributed to the presence of Cr2+ (produced by γ irradiation) exhibiting a large positive magnetic Grüneisen coefficient as predicted by a dynamic Jahn-Teller model.