多晶GdSrCaMnO化合物的磁性和磁热效应研究

Magnetic and magnetocaloric effect study of a polycrystalline GdSrCaMnO compound.

作者信息

Chatterjee Soma, Das Kalipada, Das I

机构信息

CMP Division, Saha Institute of Nuclear Physics, HBNI, AF-Bidhannagar, Kolakta, 700064, India.

Department of Physics, Seth Anandram Jaipuria College, 10-Raja Nabakrishna Street, Kolkata, 700005, India.

出版信息

Phys Chem Chem Phys. 2022 Apr 6;24(14):8233-8244. doi: 10.1039/d2cp00114d.

DOI:10.1039/d2cp00114d

PMID:35319050

Abstract

The magnetic and magnetocaloric properties of polycrystalline GdSrCaMnO ( = 0.0, 0.2, 0.3, 0.4 and 0.5) compounds have been investigated. Depending upon the Ca and Sr proportions, fascinating magnetic ground states were observed in the GdSrCaMnO compounds. Here, the dominating nature of the canted magnetic state (for the GdCaMnO compound) and glassy (disordered ferromagnetic) magnetic state (for the GdSrMnO compound) are observed. However, for the intermediate doped samples ( = 0.2, 0.3, 0.4), a competing nature is found in their magnetic and exchange bias properties. Additionally, in the low temperature region, a significantly large magnetocaloric effect is observed for all the samples. At a 70 kOe external magnetic field, the highest observed value of the magnetocaloric entropy change is 21.58 J kg K (for the GdCaMnO sample) and the lowest is 10.15 J kg K (for the GdSrMnO sample).

摘要

已对多晶GdSrCaMnO（= 0.0、0.2、0.3、0.4和0.5）化合物的磁性和磁热性能进行了研究。根据Ca和Sr的比例，在GdSrCaMnO化合物中观察到了引人入胜的磁性基态。在此，观察到了倾斜磁态（对于GdCaMnO化合物）和玻璃态（无序铁磁）磁态（对于GdSrMnO化合物）的主导性质。然而，对于中间掺杂样品（= 0.2、0.3、0.4），在其磁性和交换偏置特性中发现了竞争性质。此外，在低温区域，所有样品均观察到显著大的磁热效应。在70 kOe的外部磁场下，观察到的磁热熵变的最高值为21.58 J kg K（对于GdCaMnO样品），最低值为10.15 J kg K（对于GdSrMnO样品）。