2014/10/20 by H. Yibole, F. Guillou, L. Caron +9
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Condensed matter physics #Crystallography #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetic circular dichroism #Magnetic field #Magnetic moment #Magnetic refrigeration #Magnetization #Materials science #Multiplet #Order (exchange) #Physics #Quantum mechanics #Rare-earth and actinide compounds #Spectral line #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.91.014429
arxiv created 2014/10/20 · openalex publication_date 2015/01/23 · arxiv updated 2015/02/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
A strong electronic reconstruction resulting in a quenching of the Fe magnetic moments has recently been predicted to be at the origin of the giant magnetocaloric effect displayed by Fe2P-based materials. To verify this scenario, x-ray magnetic circular dichroism experiments have been carried out at the L edges of Mn and Fe for two typical compositions of the (Mn,Fe)2(P,Si,B) system. The dichroic absorption spectra of Mn and Fe have been measured in the vicinity of the first-order ferromagnetic transition. The experimental spectra are compared with first-principles calculations and charge-transfer multiplet simulations in order to derive the magnetic moments. Even though signatures of a metamagnetic behavior are observed either as a function of the temperature or the magnetic field, the similarity of the Mn and Fe moment evolution suggests that the quenching of the Fe moment is weaker than previously predicted.