The technique of electron-beam-induced deposition (EBID), when performed with organic precursors, typically results in relatively low metal content due to the partial decomposition of the organic precursor, leaving carbon-rich remnants in the deposition. Here we describe a method applied to noble-metal structures deposited using EBID, consisting of a post-treatment step of heating in a reactive atmosphere of oxygen, whereby the amount of carbon in the structure is strongly reduced. As a result, we have been able to increase the purity of platinum deposits from 15 at.% to nearly 70 at.%, and gold similarly from 8 at.% to nearly 60 at.%. The resistivity of these structures has also been improved by up to four orders of magnitude, to achieve (1.4 ± 0.2) × 104 µΩ cm in the case of platinum.

Deuteronium jarosite, (D 3 O)Fe 3 (SO 4 ) 2 (OD) 6 , contains a kagomé lattice of Heisenberg spins S=5/2 with a coverage of 97±1%. DC and AC susceptibility measurements show strong in-plane antiferromagnetic exchange (θ CW = -1500±300K) and a spin-glass transition at T f = 13.8K, while the magnetic contribution to the specific heat below T f rises with T as T 2 , characteristic of twodimensional propagating modes. Powder neutron diffraction reveals short-range magnetic correlations (ξ ≈ 19±2 Å) with a wavevector corresponding to the √3 x √3 spin structure at 1.9K. Numbers: (75.10Jm, 75.25.+x, 75.40Gb, 75.50Lk) PACS

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Magnetic ordering and frustation in hexagonal UNi4BMentink, S.A.M.; Drost, A.; Nieuwenhuys, G.J.; Frikkee, E.; Menovsky, A.A.; Mydosh, J.A.