Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-03-19
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.63.212406
Magnetization, DC and AC bulk susceptibility of the $S$=1 Haldane chain system doped with electronic holes, Y$_{2-x}$Ca$_x$BaNiO$_5$ (0$\leq$x$\leq$0.20), have been measured and analyzed. The most striking results are (i) a sub-Curie power law behavior of the linear susceptibility, $\chi (T)$$\sim $ $T$$^{-\alpha}$, for temperature lower than the Haldane gap of the undoped compound (x=0) (ii) the existence of a spin-glass thermodynamic transition at $T$$_g$ = 2-3 K. These findings are consistent with (i) random couplings within the chains between the spin degrees of freedom induced by hole doping, (ii) the existence of ferromagnetic bonds that induce magnetic frustration when interchain interactions come into play at low temperature.
Janod Etienne
Lannuzel Francois-Xavier
Payen Ch.
Schoumacker K.
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