Heavy fermion phases probed by temperature dependent tunneling spectroscopy

Heavy fermions offer a rich physical phenomenology at very low temperatures, exhibiting different phase transitions on cooling that determine their electronic properties. Their ground states cover many electronic interactions, such as Kondo effect, superconducting or long range magnetic ones and, eventually, their coexistence. Thus, exploring the local electronic properties of these systems using scanning tunneling microscopy/spectroscopy (STM/S) at different temperatures is essential. In this communication, tunneling spectroscopy measurements using a superconducting tip of Al in the superconducting phase of URu$_{2}$Si$_{2}$\footnote{A. Maldonado et al., \textit{Phys. Rev. B} $\mathbf{85}$, 214512 (2012)} and using one of Au in the paramagnetic and antiferromagnetic phases of, respectively, CeRu$_{2}$Si$_{2}$ and CeRh$_{2}$Si$_{2}$\footnote{A. Maldonado et al., Accepted in \textit{J. Phys.: Condens. Matter}} will be discussed. The features found in the tunneling spectroscopy of each compound at 0.15K and their respective thermal evolution reflect the formation of different electronic ground states.