Hamiltonian of the $S=\frac{1}{2}$ dimerized antiferromagnetic-ferromagnetic quantum spin chain ${BaCu}_{2}{V}_{2}{O}_{8}$ - E. S. Klyushina, A. T. M. N. Islam, J. T. Park, E. A. Goremychkin, E. Wheeler, B. Klemke, and B. Lake (American Physical Society (APS), 2018)
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Keywords: U