Novel magnetic phase in a weakly ordered spin-1/2 chain antiferromagnet Sr${}_2$CuO${}_3$

E. G. Sergeicheva, S. S. Sosin, D. I. Gorbunov +3

We present the magnetic phase diagram of a spin-1/2 chain antiferromagnet Sr${}_2$CuO${}_3$ studied by ultrasound phase-sensitive detection technique. We observe an enhanced effect of…