80 citations · 257 across the 7 of their papers we have counts for
7 papers
Structural instability of two- and three-dimensional pyrochlore spin lattices in high magnetic fields
Oleg Derzhko, Johannes Richter
We consider the quantum spin- Heisenberg antiferromagnet on the two- and three-dimensional pyrochlore lattices and examine a spin-Peierls mechanism of lowering the total e…
Coupled Cluster Treatment of the Shastry-Sutherland Antiferromagnet
R. Darradi, J. Richter, D. J. J. Farnell
We consider the zero-temperature properties of the spin-half two-dimensional Shastry-Sutherland antiferromagnet by using a high-order coupled cluster method (CCM) treatment. We fin…
Quantum phase transition in a transverse Ising chain with regularly varying parameters
O. Derzhko, J. Richter, T. Krokhmalskii +1
Using rigorous analytical analysis and exact numerical data for the spin-1/2 transverse Ising chain we discuss the effects of regular alternation of the Hamiltonian parameters on t…
Ground state and low-lying excitations of the spin-1/2 XXZ model on the kagome lattice at magnetization 1/3
A. Honecker, D. C. Cabra, M. D. Grynberg +5
We study the ground state and low-lying excitations of the S=1/2 XXZ antiferromagnet on the kagome lattice at magnetization one third of the saturation. An exponential number of no…
The spin-half Heisenberg antiferromagnet on the square-kagomé lattice: Ground state and low-lying excitations
J. Richter, J. Schulenburg, P. Tomczak +1
We discuss the ground state and the low-lying excitations of the spin-half Heisenberg antiferromagnet on the two-dimensional square-kagome lattice. This magnetic system belongs to…
Absence of magnetic order for the spin-half Heisenberg antiferromagnet on the star lattice
J. Richter, J. Schulenburg, A. Honecker +1
We study the ground-state properties of the spin-half Heisenberg antiferromagnet on the two-dimensional star lattice by spin-wave theory, exact diagonalization and a variational me…