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Nuclear Magnetic Resonances and Mn-O-P-O-Mn Superexchange Linkages in Paramagnetic and Antiferromagnetic LiMnPO4

John M. Mays*

  • Bell Telephone Laboratories, Murray Hill, New Jersey

  • *Present address: National Science Foundation, Washington, 25, D. C.
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Phys. Rev. 131, 38 – Published 1 July, 1963

DOI: https://doi.org/10.1103/PhysRev.131.38

Abstract

Nuclear magnetic resonances of P31 and Li7 have been observed in single crystals of LiMnPO4 in the antiferromagnetic and paramagnetic states as a function of orientation from 4.2-300°K. The resonances were found to be shifted from the predicted γH0 in a way that indicates the presence of unpaired electrons in 3s (and possibly 3p) orbitals of the phosphorus atoms separated from the magnetic Mn++ ions by an intervening oxygen atom. The Néel temperature is established as 34.85°±0.1°K by observation of the Li7 resonance as a function of temperature. The arrangement of spins in the antiferromagnetic state is established by a combination of NMR and susceptibility data. The structure so determined requires the presence of superexchange interactions along Mn-O-P-O-Mn paths as well as conventional Mn-O-Mn paths. Discussion is given of the observed shifts in terms of chemical bonding and of the connection between the shifts and both the conventional and longer range superexchange linkages. Linewidths and shapes and values of T1 are given and discussed briefly.

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Phys. Rev. 131, 38– Published 1 July, 1963
  • Received 28 February 1963

© 1963 American Physical Society

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