Quasi-linear magnetoresistance and the violation of Kohler's rule in the quasi-one-dimensional Ta$_4$Pd$_3$Te$_{16}$ superconductor

TL;DR

This study reveals quasi-linear, non-saturating magnetoresistance and violation of Kohler's rule in the normal state of the quasi-one-dimensional superconductor Ta$_4$Pd$_3$Te$_{16}$, indicating complex charge dynamics possibly linked to charge-density-wave fluctuations.

Contribution

It demonstrates the presence of quasi-linear magnetoresistance and Kohler's rule violation in Ta$_4$Pd$_3$Te$_{16}$, challenging existing explanations based on Dirac fermions and quantum interference.

Findings

Magnetoresistance follows a power-law with exponent close to 1.

No saturation of magnetoresistance up to 50 Tesla.

Kohler's rule is violated regardless of field orientation.

Abstract

We report on the quasi-linear in field intrachain magnetoresistance in the normal state of a quasi-one-dimensional superconductor Ta$_4$Pd$_3$Te$_{16}$ ($T_c$$\sim$4.6 K). Both the longitudinal and transverse in-chain magnetoresistance shows a power-law dependence, $\Delta \rho$$\propto$B$^\alpha$, with the exponent $\alpha$ close to 1 over a wide temperature and field range. The magnetoresistance shows no sign of saturation up to 50 tesla studied. The linear magnetoresistance observed in Ta$_4$Pd$_3$Te$_{16}$ is found to be overall inconsistent with the interpretations based on the Dirac fermions in the quantum limit, charge conductivity fluctuations as well as quantum electron-electron interference. Moreover, it is observed that the Kohler's rule, regardless of the field orientations, is violated in its normal state. This result suggests the loss of charge carriers in the normal state of this chain-containing compound, due presumably to the charge-density-wave fluctuations.