Unconventional antiferromagnetic correlations of the doped Haldane gap system Y${}_2$BaNi${}_{1-x}$Zn${}_x$O${}_5$

V. Villar, R. Mélin, C. Paulsen +3

We make a new proposal to describe the very low temperature susceptibility of the doped Haldane gap compound Y${}_2$BaNi${}_{1-x}$Zn${}_x$O${}_5$. We propose a new mean field model relevan…