Determination of the Spinon Confining Potential in a 1D, Spin-1/2 XXZ Antiferromagnet

SrCo2V2O8 is a quasi-1D, S-1/2 antiferromagnet with XXZ anisotropy. Weak interchains coupling result in long-range magnetic order at a finite temperature TN. A spinon continuum is observed above TN while below TN a series of resolution-limited sharp modes occur. The modes are due to spinons bound into pairs by the interchain coupling which acts as a confining potential. A new theory describes the bound modes except for a small but significant shift in the mode energies and intensities due to the interchain coupling. To understand the confining potential better and to achieve more accurate agreement between theory and experiment, the full Hamiltonian of SrCo2V2O8 including the details of the complex interchain coupling is needed. The goal is to measure the interchain dispersions in order to extract the Hamiltonian that will be included in the the theory as a random phase approximation.