Spin dynamics in the high-field phase of quantum-critical S =1/2 TlCuCl3 View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2002-12

AUTHORS

Ch. Rüegg, N. Cavadini, A. Furrer, K. Krämer, H.U. Güdel, P. Vorderwisch, H. Mutka

ABSTRACT

. An external magnetic field suppresses the spin-energy gap in singlet ground state S=1/2 TlCuCl3. The system becomes quantum-critical at Hc≈5.7 T, where the energy of the lowest Zeeman-split triplet excitation crosses the nonmagnetic ground state. Antiferromagnetic ordering is reported above Hc, which underlines the three-dimensional nature of the observed quantum phase transition. The intrinsic parameters of S=1/2 TlCuCl3 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. More... »

PAGES

s840-s842

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003390101156

DOI

http://dx.doi.org/10.1007/s003390101156

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1009916429


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