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YbCu5−x
Al
x
provides the possibility to tune ground state properties by a change of the valence due to the Cu/Al substitution, by pressure
as well as by the application of a magnetic field. Near to the critical concentration x
cr≈1.5 non-Fermi-liquid properties (NFL) are obvious, obeying hyperscaling. If magnetic order sets in for x>1.5, the application of moderate magnetic fields quenches order and again NFL features become evident. Hyperscaling in this
case indicates strongly interacting spin fluctuations. 相似文献
2.
3.
A new triterpenoid, 3-oxo-22alpha-hydroxy-olean-12-en-28-oic acid (1), oleanolic acid (2) and a known iridoid, 10-hydroxy-1-oxo-7-iriden-11-oic acid methyl ester (3) have been isolated from the dichloromethane extract of the dried seeds of Gardenia volkensii. Their structures were established by 1D and 2D NMR spectroscopic and MS methods. 相似文献
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