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Quantum critical phenomena in a spin-1/2 frustrated square lattice with spatial anisotropy

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arxiv 2106.12126 v1 pith:KAPFWIBX submitted 2021-06-23 cond-mat.str-el

H. Yamaguchi , Y. Iwasaki , Y. Kono , T. Okubo , S. Miyamoto , Y. Hosokoshi , A. Matsuo , T. Sakakibara
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T. Kida M. Hagiwara
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keywords criticalfrustratedlatticequantumspin-1squareanisotropicbehavior
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We present a model compound with a spin-1/2 spatially anisotropic frustrated square lattice, in which three antiferromagnetic interactions and one ferromagnetic interaction are competing. We observe an unconventional gradual increase in the low-temperature magnetization curve reminiscent of the quantum critical behavior between gapped and gapless phases. In addition, the specific heat and electron spin resonance signals indicate one-dimensional characteristics. These results demonstrate quantum critical behavior associated with one dimensionalization caused by frustrated interactions in the spin-1/2 spatially anisotropic square lattice.

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