Phase diagram of the anti-ferromagnetic xxz model in the presence of an external magnetic field

Details Phase diagram of the anti-ferromagnetic xxz model in the presence of an external magnetic field Phase diagram of the anti-ferromagnetic xxz model in the presence of an external magnetic field

1998-05-04

arxiv.org/abs/cond-mat/9805024v2

Phys. Rev. B 58, 14467 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

A LaTex file(20 pages) and 9 PS figures

Scientific paper

10.1103/PhysRevB.58.14467

The anisotropic s=1/2 anti-ferromagnetic Heisenberg chain in the presence of an external magnetic field is studied by using the standard quantum renormalization group. We obtain the critical line of the transition from partially magnetized (PM) phase to the saturated ferromagnetic (SFM) phase. The crossover exponent between the PM phase and anti-ferromagnetic Ising (AFI) phase is evaluated. Our results show that the anisotropy($\d$) term is relevant and causes crossover. These results indicate that the standard RG approach yields fairly good values for the critical points and their exponents. The magnetization curve, correlation functions and the ground state energy per site are obtained and compared with the known exact results.

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