Random interactions and spin-glass thermodynamic transition in the hole-doped Haldane system Y${}_{2-x}$Ca${}_x$BaNiO${}_5$

Abstract

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$\le$x$\le$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.

4 pages, 4 figures, to appear in Phys. Rev. B

References in corpus (9)

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• Holes in a Quantum Spin Liquid
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Cited by in corpus (3)

• Investigations of the heterometallic Ludwigite Ni${}_2$AlBO${}_5$
• Redistribution of Spectral Weight in Spin-1/2-Doped Haldane Chains
• Magnetoelastic polarons in the hole-doped quasi-one dimensional model system Y2-xCaxBaNiO5