Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8157583 | Journal of Magnetism and Magnetic Materials | 2014 | 5 Pages |
Abstract
We investigate some of the thermodynamic properties of iron based pnictides, using an effective J1âJ2âJâ¥âK spin-model containing only the local Fe moments. Both the multi-layered structure of the material, as well as the single ion anisotropy, are taken into account through the J⥠and K couplings, respectively. We derive a fully analytic expression for the magnetic contribution to the specific heat when Jâ¥=0; the case when Jâ¥â 0 is evaluated numerically. Both solutions (with no adjustable parameters) are found to compare favorably with the reported experimental data for SrFe2As2. An improvement is, however, noticed for the Jâ¥â 0 case, consistent with the layered character of these weakly coupled magnetic structures. We discuss the applicability of our formalism to other oxy/pnictides, or related magnetic materials.
Keywords
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Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
M. ElMassalami, E.C. Marino, M.B. Silva Neto,