Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 74, Issue -, Pages S840-S842Publisher
SPRINGER-VERLAG
DOI: 10.1007/s003390101156
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An external magnetic field suppresses the spinenergy gap in singlet ground state S = 1/2 TlCuCl3. The system becomes quantum-critical at H-c approximate to 5.7 T, where the energy of the lowest Zeeman-split triplet excitation crosses the nonmagnetic ground state. Antiferromagnetic ordering is reported above H-c, which underlines the three-dimensional nature of the observed quantum phase transition. The intrinsic parameters of S = 1/2 TlCiCl(3) allow us to access the critical region microscopically by neutron scattering. A substantial study of the spin dynamics in the high-field phase Of TlCuCl3 at T = 1.5 K up to H = 12 T was performed for the first time. The results possibly indicate two dynamical regimes, which can be understood within characteristically renormalized triplet modes and a low-lying dynamics of potentially collective origin.
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