Quantum magnetoresistance in the Ca-intercalated graphite superconductor CaC6

Abstract

The search for exotic materials with a linear Dirac-like dispersion in the electronic structure is one of the most challenging tasks of the condensed matter community and materials science. Revealing the nature of the interplay between such a Dirac-like and superconducting states is a crucial issue for the study of fundamental physics. Here we report the experimental observations of a large linear magnetoresistance (MR) in the Ca-intercalated graphite superconductor CaC6. A large nonsaturating MR with a magnitude as high as 244% is observed at low temperature under a magnetic field of 9 T. The magnetic field (B) dependence of MR shows a linear behavior above 3 T at low temperature, which deviates from the classical B2 behavior, pointing to the existence of an intrinsic linear Dirac-like state. The presence of such a low-energy Dirac-like dispersion in energy band structure is confirmed qualitatively by performing first-principles calculations. These findings may pave an avenue for potential applications in magnetoelectronic sensors and for further studying the interplay between the linear Dirac-like and superconducting states in exotic materials.

Source-reported materials — not catalogue approval

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