Tomonaga-Luttinger spin liquid in the spin-1/2 inequilateral diamond-chain compound K${}_3$Cu${}_3$AlO${}_2$(SO${}_4$)${}_4$

M. Fujihala, H. Koorikawa, S. Mitsuda +14

K${}_3$Cu${}_3$AlO${}_2$(SO${}_4$)${}_4$ is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in…