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We study three different measures of quantum correlations -- entanglementspectrum, entanglement entropy, and logarithmic negativity -- for(1+1)-dimensional massive scalar field in flat spacetime. The entanglementspectrum for the discretized scalar field in the ground state indicates across-over in the zero-mode regime, which is further substantiated by ananalytical treatment of both entanglement entropy and logarithmic negativity.The exact nature of this cross-over depends on the boundary conditions used --the leading order term switches from a $\log$ to $\log-\log$ behavior for thePeriodic and Neumann boundary conditions. In contrast, for Dirichlet, it is theparameters within the leading $\log-\log$ term that are switched. We show thatthis cross-over manifests as a change in the behavior of the leading orderdivergent term for entanglement entropy and logarithmic negativity close to thezero-mode limit. We thus show that the two regimes have fundamentally differentinformation content. Furthermore, an analysis of the ground state fidelityshows us that the region between critical point $\Lambda=0$ and the crossoverpoint is dominated by zero-mode effects, featuring an explicit dependence onthe IR cutoff of the system. For the reduced state of a single oscillator, weshow that this cross-over occurs in the region $Nam_f\sim \mathscr{O}(1)$.

Log to log-log crossover of entanglement in $(1+1)-$ dimensional massive scalar field