Using magnetostriction to measure the spin-spin correlation function and magnetoelastic coupling in the quantum magnet NiCl${}_2$-4SC(NH${}_2$)${}_2$

V. S. Zapf, V. F. Correa, P. Sengupta +9

We report a method for determining the spatial dependence of the magnetic exchange coupling, $dJ/dr$, from magnetostriction measurements of a quantum magnet. The organic Ni $S=1$…