We overview physical effects of exchange frustration and quantum spin fluctuations in (quasi-
) two dimensional (2D) quantum magnets (S= 1∕ 2) with square, rectangular and triangular …

We perform highly accurate density matrix renormalization group (DMRG) simulations to
investigate the ground-state properties of the spin-1/2 antiferromagnetic square lattice …

The nature of the zero-temperature phase diagram of the spin-1/2 J 1-J 2 Heisenberg model
on a square lattice has been debated in the past three decades, and it remains one of the …

Two-dimensional condensed matter is realized in increasingly diverse forms that are
accessible to experiment and of potential technological value. The properties of these …

We report magnetization and specific-heat measurements on polycrystalline samples of
BaCdVO (PO 4) 2 and show that this compound is a S= 1/2 frustrated square lattice with …

The spin 1/2 Heisenberg model on a square lattice with antiferromagnetic nearest-and next-
nearest neighbour interactions (the J 1-J 2 model) has long been studied as a paradigm of a …

We investigate the magnetocaloric properties of the two-dimensional frustrated J 1-J 2
model on a square lattice. This model describes well the magnetic behavior of two classes of …

We develop high-temperature expansions for the uniform susceptibility and specific heat of
the square-lattice J 1− J 2 Heisenberg models. Combined with a perturbative mean-field …

We study the influence of the spin lattice distortion on the properties of frustrated magnetic
systems and consider the applicability of the spin-1/2 frustrated square lattice model to …

Crystal structure, electronic structure, and magnetic behavior of the spin-1 2 quantum
magnet Na 1.5 VOPO 4 F 0.5 are reported. The disorder of Na atoms leads to a sequence of …