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Pressure-induced quantum phase transition in the spin-liquid TlCuCl3

Rüegg, C; Furrer, A; Sheptyakov, D; Strässle, T; Krämer, K; Güdel, HU; Mélési, L; (2004) Pressure-induced quantum phase transition in the spin-liquid TlCuCl3. Physical Review Letters , 93 (25) , Article 257201 . 10.1103/PhysRevLett.93.257201. Green open access

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The condensation of magnetic quasiparticles into the nonmagnetic ground state has been used to explain novel magnetic ordering phenomena observed in quantum spin systems. We present neutron scattering results across the pressure-induced quantum phase transition and for the novel ordered phase of the magnetic insulator TlCuCl3, which are consistent with the theoretically predicted two degenerate gapless Goldstone modes, similar to the low-energy spin excitations in the field-induced case. These novel experimental findings complete the field-induced Bose-Einstein condensate picture and support the recently proposed field-pressure phase diagram common for quantum spin systems with an energy gap of singlet-triplet nature.

Title:Pressure-induced quantum phase transition in the spin-liquid TlCuCl3
Open access status:An open access version is available from UCL Discovery
Publisher version:http://dx.doi.org/10.1103/PhysRevLett.93.257201
Additional information:© 2004 The American Physical Society
Keywords:quantum phase transition, dimer, insulator, neutron scattering
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology

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