Spin dynamics in the S=1/2 weakly-coupled chains antiferromagnet BaCu₂Si₂O₇

الأصل · EN

Inelastic neutron scattering is used to identify single-particle and continuum spin excitations in the quasi-one-dimensional S=1/2 antiferromagnet. In the data analysis, close attention is given to resolution effects. A gap in the continuum spectrum at Δc=4.74.8 meV is directly observed. The gap energy is in excellent agreement with existing theoretical predictions. Below the gap, the spectrum is dominated by sharp accoustic spin wave excitations.