Raman study of spin excitations in the tunable quantum spin ladder Cu(Qnx)(Cl${}_{1-x}$Br${}_x$)${}_2$

G. Simutis, S. Gvasaliya, F. Xiao +2

Raman spectroscopy is used to study magnetic excitations in the quasi one dimensional $S=1/2$ quantum spin systems Cu(Qnx)(Cl${}_{1-x}$Br${}_x$)${}_2$. The low energy spectrum is found t…