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Appearance of quantum oscillations (QO) in both thermodynamic and transportproperties of metals at low temperatures is the most striking experimentalconsequence of the existence of a Fermi surface (FS). The frequency of theseoscillations and the temperature dependence of their amplitude providesessential information about the FS topology and fermionic quasiparticleproperties. Here, we report the observation of an anomalous suppression of theQO amplitude seen in resistivity (Shubnikov de-Haas effect) at sub-kelvintemperatures in ZrTe5 samples with a single small FS sheet comprising less than5% of the first Brillouin zone. By comparing these results with measurements ofthe magneto-acoustic QO and the recovery of the usual Lifshitz-Kosevichbehavior of the Shubnikov de-Haas (SdH) effect in ZrTe$_5$ samples with amulti-sheet FS, we show that the suppression of the SdH effect originates froma decoupling of the electron liquid from the lattice. On crossing the so-calledBloch-Gr\"uneisen temperature, T$_BG$, electron-phonon scattering becomesstrongly suppressed and in the absence of Umklapp scattering the electronicliquid regains Galilean invariance. In addition, we show, using a combinationof zero-field electrical conductivity and ultrasonic-absorption measurements,that entering this regime leads to an abrupt increase of electronic viscosity.

Anomalous Shubnikov-de Haas effect and observation of the Bloch-Gr\"uneisen temperature in the Dirac semimetal ZrTe5