Abstract
We have measured the specific heat capacity of a single crystal of UPt3 in zero magnetic field, in 2 T, and in 4 T (above\(B_{C_2 } \))with the adiabatic warm-up method down to a final temperature of 15 mK. The results prove our previous assumption that the normal state of UPt3 exhibits a similar, slightly modified specific heat anomaly around 20 mK as is present in the superconducting state. It is most probably a signature of long range magnetic order. Entropy balance aboveT C is fulfilled if both low-temperature peaks are included. For UBe13 (in the superconducting state) we find no specific heat anomaly down to 24 mK but a deviation from the power law valid at higher temperatures. DC-magnetization measurements on a second single crystal of UPt3 in a SQUID system yield a temperature dependence ∼T 2 between 150 and 20 mK extending the temperature range of earlier measurements by a factor of 4.
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Schuberth, E.A., Kloss, K., Schupp, J. et al. Specific heat and magnetic susceptibility of UPt3 and UBe13 at mK-temperatures. Z. Physik B - Condensed Matter 97, 55–58 (1995). https://doi.org/10.1007/BF01317587
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DOI: https://doi.org/10.1007/BF01317587