In the last two decades low-dimensional (low-d) physics has matured into a major branch of
science. Quite generally we may define a system with restricted dimensionality d as an …

For respective quantities, ie, Hamiltonians, parameters, and energy level splittings, related to
two physically distinct notions X and Y, various cases of confused terminology have been …

The analytical crossover events in the magnon dispersion relations are discussed. As the
available experimental data show, only a few types of magnon dispersion relations are …

An overview is presented on the phase diagrams of weakly anisotropic Heisenberg
antiferromagnets, for the 3-dimensional, the quasi 2-dimensional and the quasi 1 …

It is shown that for nearly all magnets only two types of magnon dispersions occur. For the
first group of magnets, magnon dispersions are as for the linear spin chain (a sine-function …

The AuCu 3-type intermetallic compounds ReIn 3 (Re= a rare earth ion) with type-IV
magnetic space groups are predicted to show topologically nontrivial electronic states. Here …

Spin wave theory of magnetism and BCS theory of superconductivity are typical theories of
the time before renormalization group (RG) theory. The two theories consider atomistic …

It is shown that the temperature dependence of the heat capacity of the magnetic solids can
completely be described by a sequence of universal power functions of temperature …

The phase diagram of Rb 2 MnCl 4 in magnetic fields up to 8.3 T parallel to the tetragonal
axis was determined by neutron scattering. Similar to K 2 MnF 4, but unlike conventional …

We compare experimental data for temperature dependence of the magnetic order
parameter and the magnetic excitations (spin waves) in materials with a quenched orbital …