  Compounds with a kagome lattice exhibit intriguing properties and the charge
density wave (CDW) adds an additional layer of interest to research on them. In
this study, we investigate the temperature and magnetic field dependent
electrical properties under a chemical substitution and hydrostatic pressure of
ScV6Sn6, a non-magnetic charge density wave (CDW) compound. Substituting 5 % Cr
at the V site or applying 1.5 GPa of pressure shifts the CDW to 50 K from 92 K.
This shift is attributed to the movement of the imaginary phonon band, as
revealed by the phonon dispersion relation. The longitudinal and Hall
resistivities respond differently under these stimuli. The magnetoresistance
(MR) maintains its quasilinear behavior under pressure, but it becomes
quadratic after Cr substitution. The anomalous Hall-like behavior of the parent
compound persists up to the respective CDW transition under pressure, after
which it sharply declines. In contrast, the longitudinal and Hall resistivities
of Cr substituted compounds follow a two-band model and originates from the
multi carrier effect. These results clearly highlight the role of phonon
contributions in the CDW transition and call for further investigation into the
origin of the anomalous Hall-like behavior in the parent compound.
