在没有长程磁有序的情况下，磁阻挫导致了大的磁热效应。

Magnetic frustration induced large magnetocaloric effect in the absence of long range magnetic order.

机构信息

Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata, 700 064, India.

Bragg Institute, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales, 2232, Australia.

出版信息

Sci Rep. 2017 Aug 4;7(1):7367. doi: 10.1038/s41598-017-07459-3.

DOI:10.1038/s41598-017-07459-3

PMID:28779145

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5544711/

Abstract

We have synthesized a new intermetallic compound HoNiSi in a single phase with a defect crystal structure. The magnetic ground state of this material found to be highly frustrated without any long range order or glassy feature as investigated through magnetic, heat capacity and neutron diffraction measurements. The interest in this material stems from the fact that despite the absence of true long range order, large magnetocaloric effect (isothermal magnetic entropy change, -ΔS ~ 28.65 J/Kg K (~~205.78 mJ/cm K), relative cooling power, RCP ~ 696 J/Kg (~~5 J/cm) and adiabatic temperature change, ΔT ~ 9.32 K for a field change of 70 kOe) has been observed which is rather hard to find in nature.

摘要

我们合成了一种新的单相金属间化合物 HoNiSi，具有缺陷晶体结构。通过磁性、热容和中子衍射测量发现，这种材料的磁基态高度受挫，没有任何长程有序或玻璃态特征。人们对这种材料感兴趣的原因是，尽管没有真正的长程有序，但观察到了很大的磁热效应（等温磁熵变化，-ΔS~~28.65 J/Kg K（~~205.78 mJ/cm K），相对冷却功率，RCP~~696 J/Kg（~~5 J/cm）和绝热温度变化，ΔT~9.32 K 对于 70 kOe 的磁场变化），这在自然界中很难找到。