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A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6 |
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| Authors: | Dinesh Topwal U. Manju Sugata Ray S. Raj D. D. Sarma S. R. Krishnakumar M. Bertolo S. La Rosa G. Cautero |
| Affiliation: | (1) Solid State and Structural Chemistry Unit, Indian Institute of Science, 560 012 Bangalore;(2) International Centre for Theoretical Physics (ICTP), Strada Costiera 11, 34100 Trieste, Italy;(3) Sincrotrone Trieste S.C.p.A., s.s. 14 km 163, 5 Area Science Park, 34012 Trieste, Italy;(4) Present address: Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, 226-8503 Yokohama, Japan;(5) Present address: Department of Physics, Tohoku University, 9808578 Sendai, Japan;(6) Present address: Saha Institute of Nuclear Physics, 700 064 Kolkata |
| Abstract: | 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+x Mo1-x O6 with Fe-rich (x > 0) and Mo-rich (x < 0) regions. Dedicated to Prof J Gopalakrishnan on his 62nd birthday. |
| Keywords: | Double-perovskite structure disordered Sr2FeMoO6 chemical/electronic inhomogeneity phase separation spectromicroscopy spatially resolved photoemission spectroscopy |
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