Abstract
Low frequency magnetic susceptibility measurements have been performed on YbBiPt from 3 to 800 mK. In addition to the known peak at 400 mK, an anomaly exists near 120 mK. The lowest temperature feature arises from a surface phase (e.g. Bi 2Pt) and is not a property of the main material. No additional features in the susceptibility are attributed to the bulk material down to the lowest temperature.
Highlights
The unique properties of YbBiPt were first reported in 1991 when a low temperature linear specific heat coefficient of 8 J / K 2 was measured [1]
During the testing phases of Cryostat II in the UF Microkelvin Laboratory, an RF SQUID was used as a low temperature amplifier to perform AC (16Hz) susceptibility measurements from a minimum temperature of 3 - 1 mK to --225 mK
The results of the 417 Hz measurements on the dilution refrigerator are shown in Fig. 1, and similar results were obtained at 41 and 4.17 kHz
Summary
The unique properties of YbBiPt were first reported in 1991 when a low temperature linear specific heat coefficient of 8 J / K 2 (mol Yb) was measured [1]. Standard AC (41-4.1kHz) mutual inductance measurements were performed from 50 to 800mK on a homemade dilution refrigerator. During the testing phases of Cryostat II in the UF Microkelvin Laboratory, an RF SQUID was used as a low temperature amplifier to perform AC (16Hz) susceptibility measurements from a minimum temperature of 3 - 1 mK to --225 mK.
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