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| Paper IPM / P / 6650 |
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| Abstract: | |
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The anisotropic s=[1/2] antiferromagnetic Heisenberg chain in the
presence of an external magnetic field is studied by using the standard
quantum renormalization group. The critical line of the transition from
partially magnetized (PM) phase to the saturated ferromagnetic (SFM) phase is
obtained with a very good agreement with the known exact results. The critical
exponents, ground state energy, magnetization curve and correlation functions
are also calculated. Our results show that the standard RG approach, yields
fairly good values for the critical points and their exponents.
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