Specific Heat of Pr$_{\mathrm{1-x}}$Nd$_{\mathrm{x}}$Os$_{4}$Sb$_{12}$ Near 300K

The filled skutterudite compound, PrOs$_{4}$Sb$_{12}$, displays unconventional superconductivity at a relatively low critical temperature T$_{\mathrm{c}}=$1.85K. To gain better insight into this phenomenon, we study the effect of ferromagnetism on the unconventional superconductivity by using Neodymium- doped samples Pr$_{\mathrm{1-x}}$Nd$_{\mathrm{x}}$Os$_{4}$Sb$_{12}$. We measured the heat capacities of the sample with x$=$1, 0.75, 0.5, and 0.25 using relaxation calorimetry of finite heat pulse width in a cryocooler system from 11K to 300K. The electronic specific heat coefficient $\gamma $, from the analysis of specific heat, of end member compound x$=$1 concentration is found to be approximately 60 mJ/K$^{2}$-mol; this is smaller than previously estimated specific heat of approximately 520 mJ/K$^{2}$-mol, but it is still relatively large when compared to simple metals. Also at high temperature (above 11K), there are no deviations in the specific heat data between sample with x$=$1 and x$=$0.5 concentration. This poster will describe the technique used in obtaining the data and report the result analysis of specific heat measurements from sample with x$=$1, 0.75, 0.5, and 0.25 concentrations.