Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992610 | Journal of Alloys and Compounds | 2018 | 18 Pages |
Abstract
The carbon doped RMn1.7Cr0.3Si2C (Râ¯=â¯Nd, Sm, Dy) compounds were prepared by arc melting and investigated using room temperature (RT) X-ray diffraction (XRD), neutron powder diffraction (NPD) and magnetic measurements. Carbon atoms were found to occupy the interstitial site (0, 0, 0.125) in a superstructure with the space group P4/mmm at room temperature. There exists a disordered substitution between the R atoms and corresponding Si dumbbells on the same layer perpendicular to c direction in the carbides. The Mn/Cr sublattice of the carbides exhibits ferromagnetic characteristics at room temperature despite of a very short intralayer interatomic distance (dMn-Mnâ¯=â¯2.796â¯Ã
for Râ¯=â¯Dy), which is far below the critical distance for a ferromagnetic (dMn-Mn >2.87â¯Ã
) ordering of Mn sublattice due to the strong hybridization between the interstitial C and the Mn/Cr atoms. Different phase transitions of the carbides have different response to the external magnetic field. These carbides provide the potential for further research on magneto-transport properties and magnetocaloric effect. Additionally, spin reorientation was observed in SmMn1.7Cr0.3Si2C owing to the competence of magnetocrystalline anisotropy between the Mn/Cr sublattice and the Sm sublattice.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Youfang Lai, Kun Li, Guanyi Qiao, Fanggui Wang, Hui Zhao, Wenyun Yang, Jinbo Yang, Honglin Du,