THE 1D HEISENBERG ANTIFERROMAGNET MODEL BY THE VARIATION AFTER PROJECTION METHOD
نویسندگان
چکیده
منابع مشابه
Test of the Haldane Conjecture in a 1d-heisenberg (s = 1) Antiferromagnet by Optical Linear Birefringence
We report on optical linear birefringence measurements in the nearly ideal S = 1 Heisenberg antiferromagnetic chain compounds: Ni(C2HsN2)2 NO2 (C104) and Ni (CzHsNz)2 N02PF6. The temperature dependence of the magnetic contribution, proportional to that of the magnetic energy, indicates J / k = -53 K and supports the Haldane conjecture. Considerable interest has been recently stimulated by Halda...
متن کاملHeisenberg Antiferromagnet
The Heisenberg model is described. Some of the interesting behavior of Heisenberg antiferromagnets and its behavior as a function of dimension is described. One dimensional systems have no long range order, two dimensional systems order magnetically only at zero temperature, and three dimensional systems have a non-zero critical temperature. Assembling lower dimensional pieces into ladders and ...
متن کاملThe Dilute Quantum Heisenberg Antiferromagnet
Series expansions are used to treat the randomly diluted spin‐1/2 Heisenberg antiferromagnet at zero temperature. A series is obtained at zero temperature in powers of the concentration for many correlation functions and for the correlation length from which static, dynamic, and crossover exponents are estimated. The correlation length exponent is found to be 0.77±0.10 in two dimensions. The cr...
متن کاملHeisenberg antiferromagnet
The results of a detailed histogram Monte-Carlo study of critical-fluctuation effects on the magnetic-field temperature phase diagram associated with the hexagonal Heisenberg antiferromagnet with weak axial anisotropy are reported. The multiphase point where three lines of continuous transitions merge at the spin-flop boundary exhibits a structure consistent with scaling theory but without the ...
متن کاملAlternating Linear Heisenberg Antiferromagnet: The Exciton Limit
The one-dimensional alternating antiferromagnet with H=2JΣnS⃗ 2n⋅S⃗2n−1+2J′ΣnS⃗2n⋅S⃗2n+1 is studied for J′≪J. For β−1≡kBT≪J the susceptibility is expanded in powers of the exciton density as χT∝ A (βJ′, J′/J)e−2βJ + B(βJ′,J′/J)e−4βJ+⋯ and the coefficients A and B are calculated for J′/J→0. The calculation of B(βJ′,0) required the evaluation of the two-exciton scattering matrix. The interactions bet...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Modern Physics B
سال: 2013
ISSN: 0217-9792,1793-6578
DOI: 10.1142/s0217979213500586