Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-01-22
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures
Scientific paper
10.1103/PhysRevB.68.134438
Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet \nd are performed at mK temperatures in magnetic fields of almost twice the critical field $H_c$ applied perpendicular to the spin cahins. Above $H_c$ a re-opening of the spin gap is clearly observed. In the high-field N\'eel-ordered state the spectrum is dominated by three distinct long-lived excitation branches. Several field-theoretical models are tested in a quantitative comparison with the experimental data.
Broholm Collin
Honda Z.
Katsumata Katsurou
Kolezhuk Alexei
Park Sahnggi
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