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The heat capacities of the ternary compounds RENiC[sub 2] (RE=Dy, Ho, Er, and Y) were studied in the temperature range between 2 and 30 K. From the heat capacity curves, the ordering temperatures are found to be 7.5, 3.0, and 8.1 K for DyNiC[sub 2], HoNiC[sub 2], and ErNiC[sub 2], respectively. Also a small peak is found at 4.7 K for DyNiC[sub 2]. The heat capacity of YNiC[sub 2] was well-fitted with an average Debye temperature of 456 K in the temperature range between 2 and 30 K. The magnetic heat capacities and the changes of magnetic entropy for RENiC[sub 2] (RE=Dy, Ho, and Er) indicate a strong influence of the crystal field on these compounds. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

A compact eight-pole high temperature superconducting (HTS) filter is designed for the RF signal input of an HTS Josephson mixer. The filter has 18.2% fractional bandwidth centered at 11 GHz. A stepped-impedance hairpin resonator is employed to minimize the filter size. The obtained filter size is 10 mm × 2.79 mm, which is very compact. The monolithic HTS Josephson frequency down-converter that incorporated this new filter demonstrated the highest conversion efficiency to date for an HTS Josephson mixer. Both the filter and the on-chip HTS circuit module were fabricated on a 0.5 mm thick MgO wafer with a single-sided YBCO film. The design, simulation, and experimental characterization of the HTS filter are presented in this paper. The early measurement results of the integrated HTS down-converter incorporated this filter are also described. [ABSTRACT FROM AUTHOR]