Double and double double perovskites in the RMnMnTaO6 series

K. Ji, Y. Yuan, G.t. Moyo, C. Ritter, J.p. Attfield

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A new family of perovskites RMnMnTaO6 has been synthesised at high pressure for representative R ​= ​La, Nd, Sm, Eu, Gd, Y and Lu that span the whole rare earth series. The structure type changes from tetragonal P42/n double double perovskite (DDPv) type with columnar R3+/Mn2+ cation order (R ​= ​La, Nd, Sm) to monoclinic P21/n double perovskite (DPv) (R0.5Mn0.5)2MnTaO6 (R ​= ​Sm, Gd, Y, Lu) as R3+ cation size decreases. No antisite disorder or nonstoichiometry is observed. Spin ordering transitions are observed below 70 ​K and a neutron diffraction study of DDPv NdMnMnTaO6 reveals ferrimagnetic orders at TC1 ​= ​65 ​K and TC2 ​= ​40 ​K with Mn-spin reorientation due to Nd moment order at TC2 leading to magnetoelastic coupling.
Original languageEnglish
Pages (from-to)123329
JournalJournal of Solid State Chemistry
Early online date15 Jun 2022
Publication statusE-pub ahead of print - 15 Jun 2022


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