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Frustrated one-dimensional quantum spin systems are known to exhibit avariety of quantum ground states due to the effects of quantum fluctuations andfrustrations. In a spin-1/2 kagome-strip chain, which is one of the frustratedone-dimensional spin systems, many quantum phases have been found. However, themagnetic phase diagrams of the kagome-strip chain under magnetic field have notbeen fully understood. We construct magnetic phase diagrams at 0, 1/5, 3/10,1/3, 2/5, 7/15, 3/5, and 4/5 magnetization ratio in the kagome-strip chain andinvestigate magnetic properties in each phase using the density matrixrenormalization group method. We find fifteen magnetization-plateau phases, oneof which is equivalent to the spin-1 Haldane phase.

Magnetic phase diagrams of the spin-$\frac{1}{2}$ Heisenberg model on a kagome-strip chain: Emergence of a Haldane phase