Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5490877 | Journal of Magnetism and Magnetic Materials | 2017 | 6 Pages |
Abstract
In this work, we present an investigation of the magnetic and magnetocaloric properties of Mn0.98Cr(0.02-x)FexAs compounds with x = 0.002, 0.005 and 0.010. Our findings show that as Fe content increases the unit cell volume decreases, which indicates that Fe doping emulates the pressure effect on the crystalline structure. The transition temperature TC decreases as x increases and it can be set at approximate value of room temperature by changing the doping level. In addition, the magnetic entropy change ÎSM was determined using a discontinuous measurement protocol, and realistic values from the magnetocaloric effect presented by MnAs-type compounds under pressure (emulated pressure) could be obtained. The values of ÎSMMAX are very large, around â11 Jkg-1K-1 with ÎH = 15 kOe, which is higher than that observed for most compounds with TC around room temperature. However, ÎSM is confined to a narrow temperature range of 11 K. To overcome this drawback, the composition of a theoretical composite formed by our samples was calculated in order to obtain a table-shaped ÎSM curve. The simulated composite showed a high value of full width at half maximum δTFWHM of 33 K, which is much higher than that of single sample.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Jhon J. Ipus, Paula O. Ribeiro, P. von Ranke, R.J. Caraballo Vivas, Alexandre M.G. Carvalho, Adelino A. Coelho, Victorino Franco, Daniel L. Rocco,