Magnetoresistance of Sn-substituted CeCoIn5*

Electrical transport in CeCoIn5 exhibits marked similarities with other so-called ‘strange’ metals, including a linear variation of resistivity with temperature. However, among this family, CeCoIn5 has a unique magnetoresistance. In contrast to other strange metals, the magnetoresistance of CeCoIn5 exhibits a non-monotonic variation with the field, the origin of which is not well-understood. In this talk, magnetoresistance measurements of CeCoIn5 and Sn-substituted CeCoIn5 will be presented. We find that the magnetoresistance of CeCoIn5 is strongly affected by Sn-substitution, transitioning to more conventional metallic behavior as the Sn-substitution level increases. These findings will be discussed in the context of recent evidence for a quantum critical point induced by Sn-substitution in this material.