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By analyzing parameter-dependence of the linear entropy and the negativity of a block of L/2 odd-number spins, we study quantum phase transitions (QPTs) in the spin-1/2 Heisenberg XXZ model, the dimerized Heisenberg model, the dimerized-frustrated Heisenberg model and the spin-1 quadratic–biquadratic Heisenberg model. The numerical results reveal that most of the QPTs can be detected exactly by discontinuities,...
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