Abstract
The entire magnetization process of TlCuCl_{3} has been experimentally investigated up to 100T employing the single-turn technique. The upper critical field H_{c2} is observed to be 86.1T at 2K. A convex slope of the M-H curve between the lower and upper critical fields (H_{c1} and H_{c2}) is clearly observed, which indicates that a particle-hole symmetry is broken in TlCuCl_{3}. By quantum MonteCarlo simulation and the bond-operator theory method, we find that the particle-hole symmetry breaking results from strong interdimer interactions.
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