Specific heat of segmented Heisenberg quantum spin chains in (Yb_{1-x}Lu_x)_4As_3

R. Matysiak, P. Gegenwart, A. Ochiai +3

We report low-temperature specific heat, $C(T)$, measurements on (Yb${}_{1-x}$Lu${}_x$)${}_4$As${}_3$ with $x=0.01$ and $x=0.03$, where nonmagnetic Lu atoms are randomly distributed on ant…