Extreme Transverse Magnetoresistance in TiZn16

ABSTRACT Extreme magnetoresistance (XMR) is a phenomenon characterized by an increase in resistance by factors of 104–107% when a magnetic field is applied. This phenomenon is found in a number of semimetals such as WTe2, PtSn4, Cd3As2, and LaSb. The origin of XMR is still hotly debated, possibly with different materials having different (or multiple) explanations. Extreme transverse magnetoresistance of up to 8000% at 14 T and 1.8 K is measured in TiZn16, a semimetal with a multitude of bands crossing the Fermi energy, akin to PtSn4. The magnetoresistance is suppressed when the magnetic field is rotated to be parallel to the applied current, similar to PtSn4 and PdSn4. The resistance of TiZn16 follows Kohler's rule, but displays different behavior under an applied transverse field and under a longitudinal magnetic field, suggesting distinct electrical phases. Also present are Shubnikov‐de Haas and de Haas‐van Alphen oscillations with a transverse magnetic field up to 43 T, showing that despite an insulator‐like temperature‐resistance curve, charge carriers are still present. This positions TiZn16 as an interesting addition to the investigation of XMR materials as a multi‐band metal with complex Fermi surface geometries.