| We have investigated groundstate properties and the thermodynamic properties of the uniaxial anisotropic spin-one Heisenberg chain using density matrix renormalization group method and transfer matrix renormalization group method. We found that gap depending on D around Ising-critical point Dc1=-0.3145(1) is well described by linear function but the critical point Dc2=0.9684(2) which cannot easily obtain by any physical quantities except for entanglement entropy. Simultaneously x-axis string order parameter which is used to define Haldane phase with incomplete Z2×Z2 symmetry and scaling behavior of spin susceptibility at low-temperature are also exhibited. |
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