Phys. Rev. B 62, 2998–3001 (2000)Evidence of quantum criticality in the doped Haldane system Y2BaNiO5Received 13 April 2000; published in the issue dated 1 August 2000 Experimental bulk susceptibility χ(T) and magnetization M(H,T) of the S=1 Haldane chain system doped with nonmagnetic impurities, Y2BaNi1-xZnxO5 (x<~0.08), are analyzed. A numerical calculation for the low-energy spectrum of noninteracting open segments describes well experimental data above 4 K. Below 4 K, we observe power-law behaviors χ(T)∼T-α and M(H,T)∼T1-αfα(H/T), with α(<1) depending on the doping concentration x. This observation suggests the appearance of a gapless quantum phase due to a broad distribution of effective couplings between the dilution-induced moments. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.2998
DOI:
10.1103/PhysRevB.62.2998
PACS:
75.10.Jm, 75.40.Cx, 75.40.Mg, 75.45.+j
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