Scaling behavior near the itinerant ferromagnetic quantum critical point (FQCP) of NiCoCr$_{\mathrm{x}}$ for 0.8 \textless x \textless 0.95

Low temperature magnetization, resistivity and heat capacity data are reported for the concentrated solid solution NiCoCr$_{\mathrm{x}}$ as a function of temperature and magnetic field. In the quantum critical region the low field (0.001-0.01 T) magnetic susceptibility, Chi, diverges as $\approx $ T$^{\mathrm{-1/2}}$ and the magnetization data exhibits T/B scaling from 0.001 \textless B \textless 2 Tesla for T \textless 30 K. At the lowest temperatures the ratio of Chi/C$_{\mathrm{p}}$ diverges consistent with the expectations of a FQCP. At higher magnetic fields, B \textgreater 2 Tesla, the crossover temperature from the QC to Fermi liquid regime is no longer linear in B, and is better described by B$^{\mathrm{0.75}}$. This scaling behavior is particularly accurate in describing the normalized magnetoresistance data [Rho(B,T)-Rho(0,T)]/T, which is equivalent to the ratio of relaxation rates associated with magnetic field and temperature $\approx $ Tau$_{\mathrm{T}}$/Tau$_{\mathrm{B}}$. The location of the QCP is sensitive to the composition x and the strain generated during synthesis. These medium-entropy alloys are interesting model systems to explore the role of chemical disorder at FQCP. Research supported by the DOE Office of Science, Materials Science and Engineering Division, and the Energy Dissipation to Defect Evolution EFRC.