Mixed-Spin Kagome Strip: Classical Phase Diagram
S.I. Petrovaa, N.B. Ivanovb, c, J. Schnackc
aDepartment of Engineering Sciences and Mathematics, University of Applied Sciences, 33619 Bielefeld, Germany
bInstitute of Solid State Physics, Bulgarian Academy of Sciences, Tzarigradsko chaussée 72, 1784 Sofia, Bulgaria
cFakultät für Physik, Universität Bielefeld, PF 100131, D-33501, Bielefeld, Germany
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We analyze the classical phase diagram of a mixed-spin Heisenberg system defined on a kagome strip which is a cutout from the kagome lattice. The unit cell of the spin model contains a pair of corner-sharing triangles with four σ spins on the outer vertices and a S spin on the central site (S>σ). The model is a natural mixed-spin extension of the previously studied spin-½ Heisenberg kagome strip and exhibits a rich classical phase diagram containing two collinear magnetic phases, two collinear antiferromagnetic phases with different cell spins, as well as a macroscopically degenerate canted phase occupying a region around the limit of isolated σ chains.

DOI:10.12693/APhysPolA.137.976
topics: spin chains, kagome strips, spin phase diagrams