Size effects on the magnetism and magnetocaloric properties of a polymeric Ising chain

IF 2.9 3区物理与天体物理 Q3 NANOSCIENCE & NANOTECHNOLOGY

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-04-28 DOI:10.1016/j.physe.2025.116272

L.F. de Castro , C.V. Morais , F.M. Zimmer , M. Schmidt

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Abstract

We investigate the magnetism and magnetocaloric properties of a mixed-spin Ising chain composed of pentagonal pyramids with spin-1/2 particles on the pentagonal ring and a spin-1 particle on the pyramid top. By considering polymeric chains composed of a different number of pentagonal pyramids, size effects on magnetization and magnetocaloric effect were evaluated within exact enumeration. In the absence of crystal field, our results show that the increase of the chain size reduces the maximum isothermal entropy change, while the cooling capacity and the relative cooling power exhibit a weak dependence on size. On the other hand, for strengths of the crystal field near a ground-state phase transition, maximum isothermal entropy change, cooling capacity, and relative cooling power are markedly enhanced by the increase in the chain size. Therefore, our results indicate that proximity to a ground-state phase transition can lead to significant size effects on the magnetocaloric properties of polymeric mixed-spin chain magnets.

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尺寸对聚合物Ising链磁性和磁热学性质的影响

研究了一种混合自旋Ising链的磁性和磁热学性质。这种混合自旋Ising链由五边形金字塔组成，其中自旋为1/2的粒子位于五边形环上，自旋为1的粒子位于金字塔顶端。考虑由不同数目的五边形金字塔组成的聚合物链，在精确计数范围内评估了尺寸对磁化和磁热效应的影响。结果表明，在无晶体场的情况下，链尺寸的增大减小了最大等温熵变，而冷却能力和相对冷却功率对尺寸的依赖性较弱。另一方面，对于基态相变附近的晶体场强度，最大等温熵变、冷却能力和相对冷却功率随着链尺寸的增加而显著增强。因此，我们的研究结果表明，接近基态相变会导致聚合物混合自旋链磁体的磁热性能产生显着的尺寸效应。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physica E-low-dimensional Systems & Nanostructures 物理-纳米科技

CiteScore

7.30

自引率

6.10%

发文量

356

审稿时长

65 days

期刊介绍： Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals. Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena. Keywords: • topological insulators/superconductors, majorana fermions, Wyel semimetals; • quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems; • layered superconductivity, low dimensional systems with superconducting proximity effect; • 2D materials such as transition metal dichalcogenides; • oxide heterostructures including ZnO, SrTiO3 etc; • carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.) • quantum wells and superlattices; • quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect; • optical- and phonons-related phenomena; • magnetic-semiconductor structures; • charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling; • ultra-fast nonlinear optical phenomena; • novel devices and applications (such as high performance sensor, solar cell, etc); • novel growth and fabrication techniques for nanostructures