Abstract
The magnetic properties of orthorhombic LiMnO2have been investigated in detail for the first time. The susceptibility data show several features including a Curie–Weiss regime from 600 to 800 K with θp=−1056(13) K and μeff=4.82 μB/Mn3+, a broad maximum at 360 K, and a field-cooled (FC), zero field cooled (ZFC) divergence below 100 K. The broad maximum indicates two-dimensional rather than one-dimensional short-range spin correlations. A Néel temperature for a transition to three-dimensional long-range order is seen at 261.5 K from both neutron diffraction and the magnetic heat capacity behavior as determined from the susceptibility data. The magnetic structure has been solved from neutron diffraction data and has a propagation vector ofk=(1/2 1/2 1/2) and an ordered magnetic moment of 3.69(4) μB/Mn3+with a preferred direction parallel to thebaxis. The neutron scattering data also provide evidence for two-dimensional short-range correlations aboveTcat 271 K in the form of a feature with a Warren line shape. The long- and short-range order are discussed in terms of the crystal structure which is of the ordered NaCl type distorted by the presence of the Jahn–Teller ion, Mn3+.
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