Quantum matter in high magnetic fields

Abstract:

Cd(3)As(2) is a candidate three-dimensional Dirac semimetal which has exceedingly high mobility and nonsaturating linear magnetoresistance that may be relevant for future practical applications. We report magnetotransport and tunnel diode oscillation measurements on Cd(3)As(2), in magnetic fields up to 65 T and temperatures between 1.5 and 300 K. We find that the nonsaturating linear magnetoresistance persists up to 65 T and it is likely caused by disorder effects, as it scales with the high mobility rather than directly linked to Fermi surface changes even when approaching the quantum limit. From the observed quantum oscillations, we determine the bulk three-dimensional Fermi surface having signatures of Dirac behavior with a nontrivial Berry phase shift, very light effective quasiparticle masses, and clear deviations from the band-structure predictions. In very high fields we also detect signatures of large Zeeman spin splitting (g∼16).

Abstract:

These data constitute the data presented in the plots of Figures 1 and 2 in "Dichotomy between the Hole and Electron Behavior in the Multiband FeSe Probed by Ultrahigh Magnetic Fields" (Watson, PRL, 2015). The figures were created in Origin, but can be reproduced in any graphing software that can import standard ASCII files. The resistivity and Hall effect data has been scaled by the sample geometry into resistivty (not resistance) units. The data were collected in the Clarendon Laboratory, Oxford University and at the EMFL high magnetic field facilities in Toulouse.