非表示:
キーワード:
-
要旨:
Five compounds were investigated for magnetic character and
superconductivity, all with non-magnetic nickel and band structures
containing flat bands and steep bands. The syntheses and crystal
structures, refined by powder X-ray diffraction, are reported for
M6Ni16Si7, where M = Mg, Sc, Ti, Nb, and Ta. All compounds form in the
Mg6Cu16Si7 structure type. Resistance measurements are also reported on
M6Ni16Si7 (M = Mg, Sc, Ti, and Nb) down to 0.3 K, with all four showing
metallic conductivity. No superconductivity is observed. Magnetization
measurements for all compounds reveal essentially temperature
independent paramagnetism, with a tendency toward more enhanced low
temperature paramagnetism for the cases of Mg6Ni16Si7 and Sc6Ni16Si7.
(c) 2007 Elsevier Ltd. All rights reserved.