Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 87, Issue 4, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.7566/JPSJ.87.043704
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- MEXT HPCI Strategic Programs for Innovative Research (SPIRE) [hp170274]
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Magnetization plateaus in quantum spin systems emerge in two-dimensional frustrated systems such as a kagome lattice. The spin-1/2 antiferromagnetic Heisenberg model on a square-kagome lattice is also appropriate for the study of the magnetization plateau. Motivated by recent experimental findings of such a square kagome lattice with three nonequivalent bonds, we investigate the phase diagrams and magnetization plateaus of the lattice using the exact diagonalization method. In addition to the previously reported 1/3 and 2/3 plateaus in the model with two equivalent bonds, we find a new 2/3 plateau whose magnetic structure is characterized by spontaneously broken four-fold rotational symmetry. The plateau appears only in the case of three nonequivalent bonds. We propose the possibility of finding plateaus including the new one.
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