LaSrVMoO6: A case study for A-site covalency-driven local cationic order in double perovskites

Jana, SomnathCentre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, India (författare)

LaSrVMoO6 : A case study for A-site covalency-driven local cationic order in double perovskites

An unusual atomic scale chemical fluctuation in LaSrVMoO6, in terms of narrow patches of La, V and Sr,Mo-rich phases, has been probed in detail to understand the origin of such a chemical state. Exhaustive tuning of the equilibrium synthesis parameters showed that the extent of phase separation can never be melted down below a unit cell dimension making it impossible to achieve the conventional B-site ordered structure, which establishes that the observed "inhomogeneous" patchlike structure with minimum dimension of few angstroms is a reality in LaSrVMoO6. Therefore another type of local chemical order, hitherto unknown in double perovskites, gets introduced here. X-ray diffraction, electron microscopy elemental mapping, magnetic, and various spectroscopic studies have been carried out on samples, synthesized under different conditions. These experimental results in conjunction with ab initio electronic structure calculation revealed that it is the energy stability, gained by typical La-O covalency as in LaVO3, that leads to the preferential La, V and Sr,Mo ionic proximity, and the consequent patchy structure.

Singh, VijayIndian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India. (författare)
Nag, AbhishekIndian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India. (författare)
Meneghini, CarloUniv Roma Tre, Dipartimento Fis E Amaldi, I-00146 Rome, Italy. (författare)
Dasgupta, IndraIndian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India.;Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India. (författare)
Aquilanti, GiulianaSincrotrone Trieste SCpA, I-34149 Trieste, Italy. (författare)
Ray, SugataIndian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India.;Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India. (författare)
Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, IndiaIndian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India. (creator_code:org_t)

Ingår i:Physical Review B. Condensed Matter and Materials Physics86:11098-01211550-235X

Av författaren/redakt...: Jana, Somnath; Singh, Vijay; Nag, Abhishek; Meneghini, Carlo; Dasgupta, Indra; Aquilanti, Giuli ...; visa fler...; Ray, Sugata; visa färre...

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