Unbound spinons in the <i>S</i>=1/2 antiferromagnetic chain <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">KCuF</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>

D. A. Tennant; T. G. Perring; R. A. Cowley; S. E. Nagler

doi:10.1103/PhysRevLett.70.4003

Unbound spinons in the S=1/2 antiferromagnetic chain ${KCuF}_{3}$

D. A. Tennant, T. G. Perring, R. A. Cowley, and S. E. Nagler

Phys. Rev. Lett. 70, 4003 – Published 21 June 1993

Abstract

Inelastic neutron scattering has been used to study the temperature dependence of the magnetic response in the one-dimensional S=1/2 Heisenberg antiferromagnet ${KCuF}_{3}$ . The scattering is consistent with that expected for unbound spinon pair excitations.