Low-temperature metastable states in a stacked triangular Ising antiferromagnet

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• 作者：M. 沤ukovi膷 ; ^{milan.zukovic@upjs.sk} ; L. Mi啪i&scaron ; in ; A. Bob&aacute ; k
• 关键词：Ising antiferromagnet ; Stacked triangular lattice ; Geometrical frustration ; Monte Carlo simulation ; Metastable states ; Magnetization plateau
• 刊名：Physics Letters A
• 出版年：2012
• 期刊代码：57_03759601
• 类别：ph
• 出版时间：23 April, 2012
• 卷：376
• 期：21
• 页码：1731-1735
• 文件大小：812 K

摘要

We study low-temperature magnetization processes in a stacked triangular Ising antiferromagnet by Monte Carlo simulations. In increasing and decreasing magnetic fields we observe multiple steps and hysteresis corresponding to formation of different metastable states. Besides the equidistant threefold splitting of the 1/3 ferrimagnetic plateau, we additionally confirm a fourth plateau in the field-increasing branch and a sizable remanence when the field is decreased to zero. The newly observed plateau only appears at sufficiently low temperature and sufficiently large exchange interaction in the stacking direction. These observations reasonably reproduce low-temperatures measurements on the spin-chain compound Ca₃Co₂O₆.