A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6

Journal of Chemical Sciences

S R Krishnakumar4¹  G Cautero³  D D Sarma1²  M Bertolo³  S La Rosa³  S Raj1²  Dinesh Topwal²  Sugata Ray1²  U Manju² 

[1] International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34100 Trieste, Italy$$;Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012$$;Sincrotrone Trieste S.C.p.A., s.s. 14 km 163, 5 Area Science Park, 34012 Trieste, Italy$$

关键词: Double-perovskite structure;    disordered Sr2FeMoO6;    chemical/electronic inhomogeneity;    phase separation;    spectromicroscopy;    spatially resolved photoemission spectroscopy.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Disordered Sr2FeMoO6 shows a drastic reduction in saturation magnetization compared to highly ordered samples, moreover magnetization as a function of the temperature for different disordered samples shows qualitatively different behaviours. We investigate the origin of such diversity by performing spatially resolved photoemission spectroscopy on various disordered samples. Our results establish that extensive electronic inhomogeneity, arising most probably from an underlying chemical inhomogeneity in disordered samples, is responsible for the observed magnetic inhomogeneity. It is further pointed out that these inhomogeneities are connected with composition fluctuations of the type Sr2Fe1+𝑥Mo1-𝑥O6 with Fe-rich (𝑥 > 0) and Mo-rich (𝑥 < 0) regions.

【 授权许可】

Unknown