Reference : Mossbauer spectral study of the magnetocaloric FeMnP1-xAsx compounds
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/22370
Mossbauer spectral study of the magnetocaloric FeMnP1-xAsx compounds
English
Hermann, Raphaël mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Tegus, O. [> > > >]
Bruck, E. [> > > >]
Buschow, K. H. J. [> > > >]
de Boer, F. R. [> > > >]
Long, G. J. [> > > >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
2004
Physical Review b
American Physical Soc
70
21
Yes (verified by ORBi)
International
1098-0121
College Pk
[en] The magnetic phase transitions in the FeMnP1-xAsx compounds with x= 0.25, 0.35, 0.45, 0.50, and 0.55, have been studied by iron-57 Mossbauer spectroscopy. The ferromagnetic and antiferromagnetic spectra have been analyzed with a model that takes into account the random distribution of the P and As near-neighbor anions of a given iron site. This distribution is a binomial distribution of the contributions to the spectra of each iron with n As near neighbors. A magnetostriction model has been used to characterize the temperature induced paramagnetic to ferromagnetic first-order phase transition and order parameters, eta(F)=2.6, 2.3, 2.0, 1.57, and 1.43 have been obtained for x=0.25, 0.35, 0.45, 0.50, and 0.55, respectively. A detailed phase diagram has been derived from the Mossbauer spectral analysis and reveals a magnetic triple point at x=similar to0.35 and similar to210 K. A model that takes into account the random binomial P and As distribution and the contribution from the iron and manganese magnetic sublattices yields excellent fits of the spectral components assigned to the ferromagnetic and incommensurate antiferromagnetic components for the x=0.25 and 0.35 compounds at all temperatures.
http://hdl.handle.net/2268/22370
10.1103/PhysRevB.70.214425

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