Effect of doping on the magnetic ordering of quasi-one-dimensional antiferromagnets

• Veröffentlicht in: Физика низких температур
• Datum: 2006
• ISSN: 0132-6414
• 1. Verfasser: Zvyagin, A.A.
• Format: Artikel
• Sprache: Englisch
• Veröffentlicht: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2006
• Schlagworte: Низкоразмерные и неупорядоченные системы
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/120129
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Effect of doping on the magnetic ordering of quasi-one-dimensional antiferromagnets / A.A. Zvyagin // Физика низких температур. — 2006. — Т. 32, № 2. — С. 214-218. — Бібліогр.: 17 назв. — англ.

We have studied theoretically how nonmagnetic dopants, which change the local coupling of
 spins to the host, affect the low-temperature thermodynamic characteristics of quasi-one-dimensional
 (Q1D) quantum spin antiferromagnets. Our theory qualitatively and, in some cases, quantitatively
 describe the behavior of the magnetic susceptibility and specific heat of the Q1D system
 BaCu₂(Si₁₋xGex)₂O₇. We have shown that in some cases the strong disorder in the distribution of
 characteristics of magnetic impurities in quantum antiferromagnetic spin chains can be the cause of
 magnetic ordering, if such chains are weakly coupled to each other, while for homogeneous chains
 and chains with a weak disorder a small enough coupling between chains does not produce magnetic
 ordering. For other values of the parameters, magnetic impurities can decrease the Neel temperature
 compared to that of the homogeneous Q1D spin system.