Volume Dependence of Current Oscillations in NbSe3: A Finite-Size Effect

Experiments performed in the linear chain compound Nb${\mathrm{Se}}_3$ demonstrate that the oscillations associated with the current-carrying charge-density-wave condensate decrease with increasing volume of the specimens. The observed dependence of the oscillating current density $\Delta j_1$ on volume $\Omega$, $\Delta j_1\propto {\Omega }^{-\frac{1}{2}}$, is attributed to interference between independent charge-density-wave domains which oscillate at the same frequency but randomly in phase.