Abstract
Magnetic properties of NiO have been studied in the multimegabar pressure range by nuclear forward scattering of synchrotron radiation using the 67.4 keV Mössbauer transition of Ni61. The observed magnetic hyperfine splitting confirms the antiferromagnetic state of NiO up to 280 GPa, the highest pressure where magnetism has been observed so far, in any material. Remarkably, the hyperfine field increases from 8.47 T at ambient pressure to ∼24 T at the highest pressure, ruling out the possibility of a magnetic collapse. A joint x-ray diffraction and extended x-ray-absorption fine structure investigation reveals that NiO remains in a distorted sodium chloride structure in the entire studied pressure range. Ab initio calculations support the experimental observations, and further indicate a complete absence of Mott transition in NiO up to at least 280 GPa.
| Original language | English |
|---|---|
| Article number | 201110 |
| Journal | Physical Review B |
| Volume | 93 |
| Issue number | 20 |
| DOIs | |
| State | Published - May 24 2016 |
Funding
The European Synchrotron Radiation Facility is acknowledged for provision of synchrotron radiation beam time and the beamlines ID18 and ID09. The authors thank A. Chumakov and M. Hanfland for their help with ID18 and ID09 experiments, respectively. Portions of this work were performed at GeoSoilEnviroCARS (Sector 13), Advanced Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation-Earth Sciences (Grant No. EAR-1128799) and Department of Energy-GeoSciences (Grant No. DE-FG02-94ER14466). This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. V.Pt. would like to acknowledge Helmholtz Association for support in the framework of the Helmholtz Postdoctoral Program. R.P.H. acknowledges support from the Materials Sciences and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy. M.E., J.J., W.O., and I.A.A. acknowledge support from the Swedish Government Strategic Research Area Grants Swedish e-Science Research Center (SeRC) and in Materials Science on Functional Materials at Linkping University (Faculty Grant SFO-Mat-LiU No 2009 00971), as well as from Knut and Alice Wallenbergs Foundation project Strong Field Physics and New States of Matter 2014-2019 (COTXS). I.A.A. is grateful for the support provided by the Swedish Foundation for Strategic Research program SRL Grant No. 10-0026: the Swedish Research Council (VR) Grant No 2015-04391, the Grant of Ministry of Education and Science of the Russian Federation (Grant No. 14.Y26.31.0005), and Tomsk State University Academic D. I. Mendeleev Fund Program. The simulations were carried out using supercomputer resources provided by the Swedish National Infrastructure for Computing (SNIC).
| Funders | Funder number |
|---|---|
| National Science Foundation-Earth Sciences | EAR-1128799 |
| U.S. Department of Energy | DE-FG02-94ER14466 |
| Directorate for Geosciences | 1128799 |
| Office of Science | DE-AC02-06CH11357 |
| Basic Energy Sciences | |
| Argonne National Laboratory | |
| Division of Materials Sciences and Engineering | |
| Swedish e-Science Research Centre | |
| Stiftelsen för Strategisk Forskning | 10-0026 |
| Ministry of Education and Science of the Russian Federation | |
| Linköpings Universitet | 2009 00971 |
| Knut och Alice Wallenbergs Stiftelse | |
| Vetenskapsrådet | 2015-04391 |
| Tomsk State University | |
| Helmholtz Association |