Verification of Anderson superexchange in MnO via magnetic pair distribution function analysis and ab initio theory
- European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Columbia Univ., New York, NY (United States)
- Univ. of Warwick, Coventry (United Kingdom)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States)
Here, we present a temperature-dependent atomic and magnetic pair distribution function (PDF) analysis of neutron total scattering measurements of antiferromagnetic MnO, an archetypal strongly correlated transition-metal oxide. The known antiferromagnetic ground-state structure fits the low-temperature data closely with refined parameters that agree with conventional techniques, confirming the reliability of the newly developed magnetic PDF method. The measurements performed in the paramagnetic phase reveal significant short-range magnetic correlations on a ~1 nm length scale that differ substantially from the low-temperature long-range spin arrangement. Ab initio calculations using a self-interaction-corrected local spin density approximation of density functional theory predict magnetic interactions dominated by Anderson superexchange and reproduce the measured short-range magnetic correlations to a high degree of accuracy. Further calculations simulating an additional contribution from a direct exchange interaction show much worse agreement with the data. Furthermore, the Anderson superexchange model for MnO is thus verified by experimentation and confirmed by ab initio theory.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC00112704; AC52-06NA25396
- OSTI ID:
- 1253319
- Alternate ID(s):
- OSTI ID: 1252597
- Report Number(s):
- BNL-112116-2016-JA; PRLTAO; R&D Project: PM032; KC0202010
- Journal Information:
- Physical Review Letters, Vol. 116, Issue 19; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
A “non-dynamical” way of describing room-temperature paramagnetic manganese oxide
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journal | January 2019 |
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory
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journal | September 2018 |
Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet | text | January 2020 |
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