Influence of the nonmagnetic impurities on the spin-1 Heisenberg chain SrNi2V2O8 system

• Published in: Physica Status Solidi (b) 2006-05, Vol.243 (6), p.1366-1374
• Main Authors: Giapintzakis, J., Androulakis, J., Syskakis, E., Papageorgiou, Th. P., Apostolopoulos, G., Thanos, S., Papastaikoudis, C.
• Format: Article
• Language: English
• Subjects: 65.40.Ba; 75.30.Hx; 75.40.Cx; 75.50.Ee; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; General theory and models of magnetic ordering; Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics; Spin chain models
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200541030

Dc‐magnetization and heat capacity measurements on polycrystalline samples of SrNi2–x Mgx V2O8 (x = 0 and 0.05) are reported. The magnetization data suggest that both compounds are S = 1 quasi one‐dimensional Heisenberg antiferromagnets. The substitution of non‐magnetic impurity Mg2+ ions for Ni2+ induces a magnetic phase transition at ∼3.7 K. A simple Hamiltonian model is proposed for these systems giving good quantitative agreement with the experimental magnetization data. The intrachain magnetic exchange constant (J 1/k B) and the Haldane gap (Δ ) for both compounds are estimated to be ∼105 K and ∼58.3 K (5.02 meV), respectively. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)