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Title

Tunable magnetocaloric effect around room temperature by Fe doping in Mn0.98Cr(0.02-x)FexAs compound

AuthorsIpus, Jhon J.; Ribeiro, Paula O.; Ranke, P. von; Caraballo Vivas, R. J.; Carvalho, Alexandre M. G.; Coelho, Adelino A.; Franco, V. CSIC ORCID; Rocco, Daniel L.
KeywordsMagnetocaloric effect
Magnetic entropy change
Composite
MnAs and derivatives
Issue Date15-Aug-2017
PublisherElsevier
CitationJournal of Magnetism and Magnetic Materials 436: 85-90 (2017)
AbstractIn this work, we present an investigation of the magnetic and magnetocaloric properties of MnCrFeAs 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 T 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 ΔS 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 ΔS are very large, around −11 JkgK with ΔH = 15 kOe, which is higher than that observed for most compounds with T around room temperature. However, ΔS 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 ΔS curve. The simulated composite showed a high value of full width at half maximum δT of 33 K, which is much higher than that of single sample.
URIhttp://hdl.handle.net/10261/191585
DOI10.1016/j.jmmm.2017.04.030
ISSN0304-8853
Appears in Collections:(ICMS) Artículos




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