Influence of chemical doping and hydrostatic pressure on the magnetic properties of Mn1-xFexAs magnetocaloric compounds

Influence of chemical doping and hydrostatic pressure on the magnetic properties of Mn1-xFexAs magnetocaloric compounds

Author Rocco, D. L. Google Scholar
de Campos, A. Google Scholar
Carvalho, A. Magnus G. Google Scholar
dos Santos, A. O. Google Scholar
da Silva, L. M. Google Scholar
Gama, S. Google Scholar
da Luz, M. S. Autor UNIFESP Google Scholar
von Ranke, P. Google Scholar
de Oliveira, N. A. Google Scholar
Coelho, A. A. Google Scholar
Cardoso, L. P. Google Scholar
Souza, J. A. Google Scholar
Abstract This paper presents the results of an investigation of the magnetic and structural properties of Mn1-xFex As compounds under hydrostatic pressure and chemical doping. The chemical doping was performed by using low Fe doping levels (x = 0, 0.003, 0.006, 0.010, 0.015, and 0.018), which emulates the negative pressure effect on the crystal structure. The results of this approach were compared with the physical pressure effect (hydrostatic pressure from 0 to 2.2 kbar) on the Mn0.997Fe0.003As. Both approaches exhibit the same magnetic behaviors: the T-C and saturation magnetization decrease as the pressure increases; for the highest pressure studied, an orthorhombic antiferromagnetic phase occurs below the critical temperature and coexists with the ferromagnetic hexagonal phase. The equivalence between hydrostatic pressure and chemical doping indicates that the Fe doping only causes structural deformation. In addition, we performed magnetic measurements at high temperature (up to 520 K) on the samples with x = 0 and 0.003 in order to investigate the magnetic behavior above T-C = 310 K. These results, along with structural characterization, clearly show that between T-C and T-t the system is a weak antiferromagnet with short-range order confined only in the ab plane. Finally, using the low- and high-temperature data, the magnetic phase diagrams of the compound under hydrostatic pressure and chemical doping were redrawn.
xmlui.dri2xhtml.METS-1.0.item-coverage College Pk
Language English
Sponsor CNPq
Date 2016
Published in Physical Review B. College Pk, v. 93, n. 5, p. -, 2016.
ISSN 2469-9950 (Sherpa/Romeo, impact factor)
Publisher Amer Physical Soc
Extent -
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000371391800003

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