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Structure and Magnetic Properties of Sr 2 NaOsO 6
Author(s) -
Thakur Gohil S.,
Felser Claudia,
Jansen Martin
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000699
Subject(s) - chemistry , antiferromagnetism , monoclinic crystal system , condensed matter physics , magnetic susceptibility , paramagnetism , osmium , crystallography , magnetic moment , frustration , spin canting , lattice (music) , iodide , crystal structure , inorganic chemistry , magnetization , ruthenium , magnetic field , physics , biochemistry , acoustics , catalysis , quantum mechanics
Sr 2 NaOsO 6 , an ordered double perovskite, was obtained by solid‐state synthesis. The compound crystallizes in a monoclinic cell [ P 2 1 / n, a = 5.7043(1) Å, b = 5.7828(1) Å, c = 8.0816(2) Å; β = 90.01(2)°] and develops long‐range antiferromagnetic order at ≈ 17 K with strong canting generating a tiny spontaneous moment of 0.06 µ B /Os ion. A fit of the high temperature susceptibility data according to a modified Curie–Weiss law revealed a small effective paramagnetic moment of 0.7 µ B /Os, which underlines the substantial effect of spin‐orbit coupling in 5 d oxides. A broad instead of a sharp lambda anomaly in specific heat data suggests frustration and strong magnetic disorder at the osmium lattice.