Abstract
AbstractSpecific heat measurements of a Yb(Rh0.93Co0.07)2Si2 high‐quality single crystal in magnetic fields $0.5 \leq \mu _0 H \leq 10$ T and in the temperature range between 0.05 and 4 K are presented. To extract the electronic specific heat Cel from the raw data, and consequently the temperature dependence of the Sommerfeld coefficient $\gamma = {{C_{{\rm el}} } \mathord{\left/ {\vphantom {{C_{{\rm el}} } T}} \right. \kern-\nulldelimiterspace} T}$, the nuclear magnetic and electric contributions to the specific heat have been evaluated. The error between the experimental data below 1 K and the theoretical calculation varies between 0.9 and 8.7%, indicating that the coefficients used in our model are accurate and appropriate. The high‐field ground state is confirmed to be a Fermi liquid. This analysis allows to determine the H‐dependence of γ for fields larger than 0.5 T and its change across the anomaly at $\mu _0 H_0 \approx 5.8$ T.
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