values that correspond to universality classes of standard models (Ising (sample with x =0), XY (sample with x =2), and Heisenberg (sample with x =4)) with short-range interactions to universality class of mean field model (samples with x =6, 8, and 10) with long-range interactions....
We obtain the axial next-nearest-neighbor Ising model from a Heisenberg model with large single-ion anisotropy energy, D, as might be relevant for helical ... AB Harris,C Micheletti,JM Yeomans - 《Physical Review Letters》 被引量: 19发表: 1995年 Field-induced phase transition in the quantum...
Ground-state and finite-temperature phase diagrams of a geometrically frustrated spin-1/2 Ising-Heisenberg model on a triangle-hexagon lattice are investigated within the generalized star-triangle mapping transformation. It is shown that the ground state is constituted by two different spontaneously long...
Heisenberg modelIsing modelexchange interactions (electronantiferromagnetismfrustrationmagnetisationWe have considered the $S=1/2$ antiferromagnetic Heisenberg model in two dimensions, with an additional Ising nn interaction. Antiferromagnetic nn interactions will lead to frustration, and the system responds with...
Theoretical or Mathematical/ Heisenberg modelIsing modelspin dynamicsspin fluctuations/ time-dependent autocorrelationcorrelation functionspin-1/2 Ising-Heisenberg doubly decorated planar modelthermal fluctuationquantum fluctuationspin dynamicsspin-state interchange...
Shifting from Ising model to Heisenberg model critical behavior and the departure from these models in Fe_(73.5-x)Cr_xCu_1Nb_3Si_(13.5)B_9Universality classStatic critical exponentsCurie temperatureFe73.5-xCrxCu1Nb3Si13.5B9-based metallic glasses...
2D Ising modelIsing-Heisenberg modelHere we consider the Ising-Heisenberg model in the expanded Kagome lattice, also known as triangle-dodecagon (3-12) or star lattice. This model can still be understood as a decorated honeycomb lattice. Assuming that the Heisenberg spins are at the vertices of...
Heisenberg modelIsing modeliterative methodsmagnetic susceptibilitymagnetic transitionsmagnetisationMagnetic properties of a diamond chain consisting of spin-1/2 Ising- and Heisenberg-type atoms are investigated using the generalized decoration-iteration technique that removes all the Heisenberg-type atoms from ...
We report on the closing of gaps in the ground state of the critical Heisenberg-Ising chain at momentum $\pi$. For half-filling, the gap closes at special values of the anisotropy $\Delta= \cos(\pi/Q)$, $Q$ integer. We explain this behavior with the help of the Bethe Ansatz and ...
(2010) Rigorous criterion for reentrance in the spin-1/2 Ising–Heisenberg model on diamond-like decorated Bethe lattices. Acta Phys. Pol. A 118: pp. 725-727Ekiz, C., Strecka, J., Jascur, M.: J. Magn. Magn. Mater. 323 , 493 (2011) ADS...