Reference : Structural, Electronic, and Magnetic Properties of UFeS3 and UFeSe3
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/81706
Structural, Electronic, and Magnetic Properties of UFeS3 and UFeSe3
English
Jin, G. B. [Northwestern University > Chemistry > > >]
Ringe, Emilie [Northwestern University > Chemistry > > >]
Long, Gary J. mailto [Missouri University of Science and Technology > Chemistry > > >]
Grandjean, Fernande mailto [Université de Liège - ULg > Département de physique > Département de physique >]
Sougrati, Moulay T. [University of Liege > Physics > > >]
Choi [National Magnet Laboratory Florida > > > >]
Wells []
Balasubramanian []
Ibers, J. A. [Northwestern University > Chemistry > > >]
Dec-2010
Inorganic Chemistry
American Chemical Society
49
10455
Yes (verified by ORBi)
International
0020-1669
1520-510X
Washington
DC
[en] Crystal structure ; magnetic properties ; Mossbauer spectroscopy
[en] Black prisms of UFeS3 and UFeSe3 have been synthesized by solid-state reactions of U, Fe, and S or Se with CsCl as a flux at 1173 K. The structure of these isostructural compounds consists of layers of edge- and corner-sharing FeS6 or FeSe6 octahedra that are separated by layers of face- and edge-sharing US8 or USe8 bicapped trigonal prisms. The isomer shifts in the iron-57 Mössbauer spectra of both UFeS3 and UFeSe3 are consistent with the presence of high-spin iron(II) ions octahedrally coordinated to S or Se. The XANES spectra of UFeS3 and UFeSe3 are consistent with uranium(IV). Single-crystal magnetic susceptibility measurements along the three crystallographic axes of UFeSe3 reveal a substantial magnetic anisotropy with a change of easy axis from the a-axis above 40 K to the b-axis below 40 K, a change that results from competition between the iron(II) and uranium(IV) anisotropies. The temperature dependence of the magnetic susceptibility along the three axes is characteristic of two-dimensional magnetism. A small shoulder-like anomaly is observed in the magnetic susceptibilities along the a- and b-axes at 96 K and 107 K, respectively. Below 107 K, the iron-57 Mössbauer spectra of UFeS3 and UFeSe3 show that the iron nuclei experience a magnetic hyperfine field that results from long-range magnetic ordering of at least the iron(II) magnetic moments because the field exhibits Brillouin-like behavior. Below 40 K there is no significant change in the Mössbauer spectra as a result of change in magnetic anisotropy. The complexity of the iron-57 Mössbauer spectra and the temperature and field dependencies of the magnetic properties point towards a complex long-range magnetic structure of two independent iron(II) and uranium(IV) two-dimensional sublattices. The temperature dependence of the single-crystal resistivity of UFeSe3 measured along the a-axis reveals semiconducting behavior between 30 and 300 K with an energy gap of ca. 0.03 eV below the 53 K maximum in susceptibility, of ca. 0.05 eV between 50 and 107 K, and of 0.03 eV above 107 K; a negative magnetoresistance was observed below 60 K.
http://hdl.handle.net/2268/81706

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