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Phys. Rev. B 56, R5736–R5739 (1997)

Phase diagram of the S=1/2 frustrated coupled ladder system

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B. Normand
Theoretische Physik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland

K. Penc
Max Planck Institut für Physik komplexer Systeme, Bayreuther Strasse 40, D-01187 Dresden, Germany

M. Albrecht and F. Mila
Laboratoire de Physique Quantique, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex, France

Received 25 March 1997; published in the issue dated 1 September 1997

We present a theoretical study of the magnetic phase diagram of the frustrated coupled ladder structure realized recently in several materials. This system displays a nondegenerate spin-gap state in the dimer limit and an infinitely degenerate spin-gap state in the regime of weakly coupled zigzag chains. Between these we demonstrate the existence of gapless, magnetically ordered regions whose order is antiferromagnetic close to the honeycomb lattice limit, and incommensurate along the chains when all three magnetic interactions compete.

© 1997 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.R5736
DOI:
10.1103/PhysRevB.56.R5736
PACS:
75.30.Kz, 75.10.Jm, 75.40.Cx
 
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