Field and Impurity Induced Ordering in Interacting Dimer Systems

• Published in: Progress of theoretical physics. Supplement Vol. 159; no. 159; pp. 376 - 386
• Main Authors: Mikeska, Hans-Jürgen, Kolezhuk, Alexei
• Format: Journal Article
• Language: English
• Published: Kyoto Oxford University Press 01.01.2005; Progress of Theoretical Physics
• Subjects: Exact sciences and technology; Physics; Antiferromagnetism; Phase diagrams; Weak coupling; Critical field; Magnetic fields; Long-range order

We study the interplay of doping and an external magnetic field H on dimerized antiferromagnetic S = 1/2 systems with a finite spin gap Δ. We show that for sufficiently small three-dimensional coupling J′ the long-range antiferromagnetic order known to result from doping with nonmagnetic impurities...