Abstract of Publication No. 359
The inelastic neutron scattering technique was employed to study the magnetic
excitation spectra in the diluted one-dimensional Heisenberg antiferromagnet
CsMn1-xMgxBr3 (x=0, 0.05,
0.10, 0.25, 0.50). The spectral response is interpreted in terms of spin-wave
excitations in finite chain segments of Mn2+ ions, which are found to
exist as long as the chain length exceeds twice the wavelength of the spin
excitation. This limit determines the crossover into the mesoscopic regime.