Abstract
Specific heat measurements have been performed in the doped spin gap system TlCu1ixMgxCl3 with x ≤ 0.3 in order to investigate the impurity- and field-induced antiferromagnetic phase transitions. The parent compound TlCuCl3 is a three-dimensional coupled spin dimer system, which has a singlet ground state with an excitation gap ∆/kB=7.5 K. Well-defined phase transitions were observed in TlCu1ixMgxCl3 for H ≤ 9 T. The magnetic field vs temperature phase diagram was obtained. It was found that there is no boundary separating impurity- and field-induced antiferromagnetic phases, i.e., these two phases are identical. The result is discussed in connection with the recent theory by Mikeska et al. [Phys. Rev. Lett. 93 (2004), 217204].
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