Crystal and magnetic structures of copper-based double double perovskites
Using high pressure and high temperature (HPHT) synthesis, we recently found a new P42/n double double perovskite (DDPv) type combining columnar order of the A-site cations with rock-salt order at the B sites. They are notable for their magnetic properties, e.g. MnRMnSbO6 have multiple ordering transitions of rare earth (R) and Mn moments, CaMnFeReO6 is ferrimagnetic with Tc = 500 K, and CaMnNiReO6 is ferromagnetic with four parallel spin sublattices. We have recently synthesised two new high pressure and high temperature double double perovskites, CaCuMReO6 with M = Fe and Cr. These materials are notable as the first examples on Mn-free double double perovskites. Magnetisation measurements reveal ferrimagnetism with high Tc’s (~500 K). Powder neutron diffraction is needed to investigate the crystal and magnetic structures of these double double perovskites. We request two days of beamtime at D20 with the cryofurnace in view of the small amounts of sample available (50 mg each). This will allow measurements to be done from base temperature up to 550 K, above the ferrimagnetic Tc.
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J. Paul Attfiel;d; C. Aguilar-Maldonado; ALHARBI Khalid; AREVALO LOPEZ Angel; Padraig Kearins; RITTER Clemens and Elena Solana-Madruga. (2019). Crystal and magnetic structures of copper-based double double perovskites. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2690
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