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 and P. Vorderwisch
Additional contact information
Ch. Rüegg: ETH Zürich & Paul Scherrer Institut
N. Cavadini: ETH Zürich & Paul Scherrer Institut
A. Furrer: ETH Zürich & Paul Scherrer Institut
H.-U. Güdel: Universität Bern
K. Krämer: Universität Bern
H. Mutka: Institut Laue-Langevin
A. Wildes: Institut Laue-Langevin
K. Habicht: BENSC, Hahn-Meitner-Institut
P. Vorderwisch: BENSC, Hahn-Meitner-Institut

Nature, 2003, vol. 423, issue 6935, 62-65

Abstract: 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 coupled1 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 possible2. 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 predicted3 gapless Goldstone mode characteristic of the Bose–Einstein condensation of the triplet states.

Date: 2003
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/nature01617 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:423:y:2003:i:6935:d:10.1038_nature01617

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/nature01617

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().