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Bose-Einstein condensation of the triplet states in the magnetic insulator TlCuCl3 | | Ch Rüegg
; N Cavadini
; A Furrer
; H-U Güdel
; K Krämer
; H Mutka
; A Wildes
; K Habicht
; P Vorderwisch
; | | Date: |
1 May 2003 | | Journal: | Nature, 423 (6935), 62-5 | | Abstract: | Bose-Einstein condensation denotes the formation of a collective quantum ground state of identical particles with integer spin or intrinsic angular momentum. In magnetic insulators, the magnetic properties are due to the unpaired shell electrons that have half-integer spin. However, in some such compounds (KCuCl3 and TlCuCl3), two Cu2+ ions are antiferromagnetically coupled to form a dimer in a crystalline network: the dimer ground state is a spin singlet (total spin zero), separated by an energy gap from the excited triplet state (total spin one). In these dimer compounds, Bose-Einstein condensation becomes theoretically possible. At a critical external magnetic field, the energy of one of the Zeeman split triplet components (a type of boson) intersects the ground-state singlet, resulting in long-range magnetic order; this transition represents a quantum critical point at which Bose-Einstein condensation occurs. Here we report an experimental investigation of the excitation spectrum in such a field-induced magnetically ordered state, using inelastic neutron scattering measurements of TlCuCl3 single crystals. We verify unambiguously the theoretically predicted gapless Goldstone mode characteristic of the Bose-Einstein condensation of the triplet states. | | Source: | PubMed, pmid12721623 doi: 10.1038/nature01617 | | Services: | Forum | Review | Favorites | |
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