X-Ray Scattering at FeCo(001) Surfaces and the Crossover between Ordinary and Normal Transitions

X-ray scattering from surfaces: discrete and continuous components of roughness

X-ray study of the liquid potassium surface: structure and capillary wave excitations

XOR-Ising Loops and the Gaussian Free Field

XXX Spin Chain: from Bethe Solution to Open Problems

XXZ and Ising Spins on the Triangular Kagome Lattice

XXZ Bethe states as highest weight vectors of the $sl_2$ loop algebra at roots of unity

XXZ Bethe states as highest weight vectors of the $sl_2$ loop algebra at roots of unity

XY frustrated systems: continuous exponents in discontinuous phase transitions

XY model in small-world networks

XY Spin Fluid in an External Magnetic Field