Crystal and magnetic structure of Ruddlesden-Popper nitride Ce2TaN4
Ruddlesden-Popper (RP) type metal oxides are an important family of layered perovskite-derived materials with notable electronic and magnetic properties such as superconductivity in cuprates, e.g. doped-La2CuO4, and giant magnetoresistance in manganites. However, stoichiometric RP nitrides R1+nMnN1+3n (n = 1, 2, 3) had not until very recently been experimentally reported. We recently prepared the first K2NiF4-type nitrides and we have extended this work with discovery of the first mixed valent RP nitride CeIIICeIVTaVN4. Ce2TaN4 crystallizes in an orthorhombic variant of the n = 1 RP structure type. Powder neutron diffraction (PND) data are required for determination of accurate N positions, to check for the possibility of long range CeIII/CeIV charge order, as well as refinement of N-occupancies to check that no oxygen is present. The magnetic susceptibility of Ce2TaN4 has a ferro/ferri magnetic ordering observed at TC = 5 K. The ground state probably has a weak ferromagnetic (canted antiferromagnetic) spin order and PND data are also required to determine the magnetic structure below 5 K. 1 day on D20 is optimal for a small sample ~100 mg obtained from high-pressure synthesis
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J. Paul Attfiel;d; JI Kunlang; KLOSS Simon; RITTER Clemens and YUAN Yao. (2023). Crystal and magnetic structure of Ruddlesden-Popper nitride Ce2TaN4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2949
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