Crystal and magnetic structures of the high pressure CaMnMSbO6 (M = Cr, Fe) double double perovskites.
Perovskites, with the general formula ABO3, are of great interest due to their large variety of electronic and magnetic properties. Their composition can be modified to induce different cation orders into double perovskites (DPv), of general formula AA'B2O6 or A2BB'O6, and eventually doubly ordered perovskites (AA'BB'O6). Using high pressure and high temperature (HPHT) synthesis, we recently found a new type of perovskite derivative combining columnar order of the A-site cations with rock-salt order at the B sites into a so-called double double perovskite (DDPv). This structure crystallises with P42/n space group and a few cationic combinations have been checked to stabilise it under HPHT conditions. Here we present two new DDPvs CaMnCrSbO6 and CaMnFeSbO6. They show ferrimagnetic behaviours with a single (Cr, TN = 49 K) and two successive (Fe, TN1 = 55 K, TN2 = 21 K) transitions respectively. Their accurate cation order is intended to be determined from room temperature NPD and their magnetic structures will be characterised at 1.5 K. The thermal evolution of their magnetic structures will also be studied.
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Elena Solana-Madruga; ALHARBI Thamer; ALHARBI Khalid; J. Paul Attfiel;d; Padraig Kearins and RITTER Clemens. (2019). Crystal and magnetic structures of the high pressure CaMnMSbO6 (M = Cr, Fe) double double perovskites.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2623
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