Strongly correlated spin systems can be driven to quantum critical points via various routes.
In particular, gapped quantum antiferromagnets can undergo phase transitions into a …

We report an inelastic neutron scattering study of magnetic excitations in a quantum
paramagnet driven into a magnetically ordered state by chemical substitution, namely Ni (Cl …

We studied electron spin resonance in a quantum magnet NiCl 2-4 SC (NH 2) 2,
demonstrating a field-induced quantum phase transition from a quantum-disordered phase …

The isostructural series of S= 1 quantum magnets Cs 1− x Rb x FeCl 3 is investigated, using
both thermodynamic measurements and inelastic neutron scattering experiments. It is found …

Motivated by recent experiments on quantum magnet NiCl 2-4SC (NH 2) 2 (DTN) and its Br-
doped counterpart DTNX we propose a theoretical description of optical magnon branch in …

The analytical theory of density of states (DOS) in three-dimensional quantum magnets with
the bond disorder is proposed based on the self-consistent T-matrix approximation …

Motivated by recent experimental data on dichloro-tetrakis thiourea-nickel (DTN)[Soldatov et
al., Phys. Rev. B 101, 104410 (2020)], a model of antiferromagnet on a tetragonal lattice with …

Inelastic neutron scattering is used to investigate the temperature dependence of spin
correlations in the 3-dimensional XY antiferromagnet Ni (Cl 1− x Br x) 2· 4 SC (NH 2) 2, x …

In this thesis, the effects of quenched disorder on zero-temperature spectral densities in
gapped quantum antiferromagnets are studied. We calculate effective models in the …

Quantum phase transitions and their properties at the quantum critical point are very active
topics in condensed-matter physics. Although quantum phase transitions are observed only …