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1
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Low-Temperature Thermodynamics of Spin-1/2 Orthogonal-Dimer Chain with Ising and Heisenberg Interactions

100%
Verkholyak T., Strečka J.
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vol. 126
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issue 1
22-23
EN
We consider an exactly solvable version of the quantum spin-1/2 orthogonal-dimer chain with the Heisenberg intra-dimer and Ising inter-dimer couplings. The investigated quantum spin system exhibits at zero temperature fractional plateaux at 1/4 and 1/2 of the saturation magnetization and it has a highly degenerate ground state at critical fields where the magnetization jumps. We study the field dependence of the specific heat at low temperature. The lattice-gas description is formulated in a vicinity of critical fields to explain the low-temperature behaviour of specific heat.
2
Content available remote

Effect of On-Site Coulomb Repulsion on Phase Transitions in Exactly Solved Spin-Electron Model

81%
Gálisová L., Strečka J., Tanaka A., Verkholyak T.
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issue 5
942-943
EN
A hybrid lattice-statistical model on doubly decorated planar lattices, which have localized Ising spins at their nodal lattice sites and two itinerant electrons at each pair of decorating sites, is exactly solved by the use of a generalized decoration-iteration transformation. Our main attention is focused on an influence of the on-site Coulomb repulsion on ground-state properties and critical behavior of the investigated system.
3
Content available remote

Dynamic Correlations in a Random Spin-1/2 XY Chain

81%
Verkholyak T., Derzhko O., Krokhmalskii T., Stolze J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
441-444
EN
We examine dynamic quantities of a random spin-1/2 isotropic XY chain in a transverse field. The randomness is related to the sign of the nearest-neighbor exchange interaction and can be eliminated by a suitable transformation. As a result, the dynamic quantities for the random spin chain are related to the same dynamic quantities for the homogeneous spin chain. We use the available results for the latter model to discuss the effect of randomness on the dynamic structure factors of the quantum spin chain.
4
Content available remote

Spin-1/2 XX Chains with Three-Spin Interactions

81%
Krokhmalskii T., Derzhko O., Verkholyak T., Stolze J.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
437-440
EN
We consider a spin-1/2 XX chain with three-spin interactions which is equivalent to a system of noninteracting spinless fermions.We examine some dynamic quantities of the spin model.In particular, we calculate analytically the dynamic transverse (zz) structure factor which is governed by a two-fermion excitation continuum. Moreover, we compute numerically the dynamic xx structure factor which is a many-fermion dynamic quantity.We illustrate how the three-spin interactions manifest themselves in the dynamic probes.
5
Content available remote

Spin-1/2 XXZ Diamond Chain within the Jordan-Wigner Fermionization Approach

81%
Verkholyak T., Strečka J., Jaščur M., Richter J.
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issue 5
978-979
EN
The spin-1/2 XXZ diamond chain is considered within the Jordan-Wigner fermionization. The fermionized Hamiltonian contains the interacting terms which are treated within the Hartree-Fock approximation. We obtain the ground-state magnetization curve of the model for some particular cases and compare the results with the exact diagonalization data for finite chains of 30 spins and known exact results. We also analyze the validity of the suggested approximation.
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