Magnetic-field-induced transitions and evolution of magnetotransport properties in quasi-two-dimensional KMo6O17in the charge-density-wave phase

Abstract

Longitudinal magnetoresistivity ρ xx (B) and Hall resistivity ρ xy (B) of KMo 6 O 17 single crystals have been measured up to 60 T in a pulse magnet. Remarkable and unusual features at characteristic magnetic fields were found in both ρ xx (B) and ρ xy (B), which were attributed to Fermi surface reconstructions caused by field-induced density-wave transitions. To understand these transitions in detail, we analyzed ρ xx (B) and ρ xy (B) based on a multiband model. This model successfully described the experimental results, revealing that charge carriers are increased significantly at these transitions with increasing magnetic field as a result of the Fermi surface reconstruction. In particular, the charge carriers are increased by two orders of magnitude at B osc = ∼40 T, above which a quantum oscillation emerges in both ρ xx (B) and ρ xy (B). This strongly suggests that the field-induced quantum oscillation is closely related with the induced charge carriers.

Interplay between disorder and inversion symmetry: Extreme enhancement of the mobility near the Weyl point in BiTeI

“…The shape of ∆ρ H in Fig. 3(b) is reminiscent of the general case for the Hall resistivity with two types of charge carriers [22]. In the limit that one mobility is much larger than the other, the formula at the low field region is simplified into…”