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

TL;DR

This study investigates quantum critical phenomena in a spin-1/2 anisotropic frustrated square lattice, revealing quantum critical behavior, one-dimensional characteristics, and the effects of competing magnetic interactions.

Contribution

It introduces a model compound exhibiting quantum criticality and one-dimensionalization due to frustrated interactions in an anisotropic square lattice.

Findings

Observation of quantum critical behavior in magnetization curves

Specific heat and ESR signals indicate one-dimensional characteristics

Frustrated interactions induce quantum criticality and dimensional reduction

Abstract

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.