Abstract
We have measured the specific heat vs. temperature in fields to 20 T of UPd2Al3 in order to try to determine the reason for the disagreement in the magnetic phase diagram as determined by magnetization and χ ac vs. resistivity measurements, with the resistivity measurements showing the magnetic anomaly trending towards T=0 as H→H metamag. Our data show a slight monotonic suppression of T N with increasing field in agreement with both previous magnetoresistance and magnetization data until H→H metamag. However, as field exceeds 17 T the specific heat shows a peak (presumably in a narrow field range connected with both antiferromagnetism and the H>H metamag magnetization anomaly) that is suppressed with further increases in field no lower in temperature than 11.7 K (in contrast to the feature in the magnetoresistivity which, e.g., occurs at 8.4 K in 18 T) before it starts to move up in temperature with increasing field at H≥18 T (H metamag). Possible causes of the specific heat anomaly for H>H metamag, as well as for the discrepancy between the specific heat and the resistivity as H→H metamag, are discussed.
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Kim, J.S., Sato, N.K. & Stewart, G.R. Specific Heat Near Hmetamag=18 T in UPd2Al3. Journal of Low Temperature Physics 124, 527–535 (2001). https://doi.org/10.1023/A:1012217812087
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DOI: https://doi.org/10.1023/A:1012217812087