Large magnetoresistance in the iron-free pnictide superconductor LaRu2P2
Abstract
The magnetoresistance of iron pnictide superconductors is often dominated by electron-electron correlations and deviates from the H2 or saturating behaviors expected for uncorrelated metals. Contrary to similar Fe-based pnictide systems, the superconductor LaRu2P2 (Tc = 4 K) shows no enhancement of electron-electron correlations. Here we report a non-saturating magnetoresistance deviating from the H2 or saturating behaviors in LaRu2P2. We have grown and characterized high quality single crystals of LaRu2P2 and measured a magnetoresistance following H1.3 up to 22 T. We discuss our result by comparing the bandstructure of LaRu2P2 with Fe based pnictide superconductors. The different orbital structures of Fe and Ru leads to a 3D Fermi surface with negligible bandwidth renormalization in LaRu2P2, that contains a large open sheet over the whole Brillouin zone. We show that the large magnetoresistance in LaRu2P2 is unrelated to the one obtained in materials with strong electron-electron correlations and that it is compatible instead with conduction due to open orbits on the rather complex Fermi surface structure of LaRu2P2.
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