Abstract
TlCuCl3 is a quantumspin liquid of S = 1/2 Cu2+ dimers. Interdimer superexchange interactions give a three-dimensional magnon dispersionand a spin gap significantly smaller than the dimer coupling, which is closed by an appliedhydrostatic pressure of approximately 2.5 kbar or by a magnetic field of 5.6 T, offering aunique opportunity to explore both the pressure- and field-induced quantum phasetransitions and their associated critical phenomena.
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