Nuclear magnetic resonance in ultra high magnetic fields: Recent applications to quantum spin systems.

In this review, we present recent applications of nuclear magnetic resonance (NMR) for probing, at the microscopic level, new quantum states of condensed matter that emerge in strong static and pulsed magnetic fields. We focus on experiments performed in resistive magnets (up to 34 T) and hybrid magnets (max 45 T), further extended to fields beyond 60 T using pulsed magnets, which together offer broad access to these quantum states and the quantum phase transitions between them. After a brief overview of NMR observables, we discuss several topics: quantum spin systems (including spin chains, spin ladders, spin-nematic phases), and their exotic phenomena (magnetization plateaux, Bose-Einstein condensation of triplet excitations), as well as aspects of novel multiferroic systems.