Lay summary
Quantum magnetism remains at the forefront of condensed matter physics. On one hand, it provides the ideal arena for developing and testing new fundamental concepts in solid-state and statistical physics, on the other hand it has a pivotal role in several classes of emerging materials with new electronic properties, e.g. the high-temperature superconducting cuprates. This project combines solid state synthesis, neutron scattering and bulk methods in the exploration of new quantum magnets, which encompas the archetype of quantum entanglment - the singlet dimer unit. The physics encountered in such systems range from quantum phase transitions to theoretical conjectures of supersolids and superconductivity.