2001/03/19 by Étienne Janod, E. Janod, C. Payen +3
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.212406
4 pages, 4 figures, to appear in Phys. Rev. B
arxiv created 2001/03/19 · openalex publication_date 2001/05/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Magnetization, dc and ac bulk susceptibility of the S=1 Haldane chain system doped with electronic holes, Y_2\ensuremath-xCaxBaNiO5 (0<~x<~0.20), have been measured and analyzed. The most striking results are (i) a sub-Curie power law behavior of the linear susceptibility \ensuremathχ(T)\ensuremath∼T^\ensuremath-\ensuremathα, for temperature lower than the Haldane gap of the undoped compound (x=0) and (ii) the existence of a spin-glass thermodynamic transition at Tg=2--3 K. These findings are consistent with (i) random couplings within the chains between the spin degrees of freedom induced by hole doping and (ii) the existence of ferromagnetic bonds that induce magnetic frustration when interchain interactions come into play at low temperature.