Abstract
AbstractThe specific heat coefficient of YbRh2Si2 shows a sudden strong increase, the so‐called “upturn” at $T \approx 300\;{\rm mK}$ which also manifest itself in ac susceptibility and electrical resistivity. In mono‐isotopic 174YbRh2Si2 this upturn is absent.At first glance, this points to a nuclear contribution as origin of the anomaly. However, based on resistivity results also impurities might be held responsible for the exotic anomaly at 300 mK.
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