Magnetic coupling between nonmagnetic ions:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Eu</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>in EuN and EuP

Johannes, M. D.; Pickett, Warren E.

doi:10.1103/physrevb.72.195116

Cited by 69 publications

(60 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The majority spin direct gap at X is quite similar in energy to the measured optical absorption edge. However, it is uncertain whether EuN could order ferromagnetically, 27 given the J = 0 ground state of the Eu 3+ ion, and our measurements have found no evidence for such ordering at the temperatures used for the optical spectroscopy. 33 We have previously shown that for GdN the optical absorption edge in the paramagnetic state is reasonably well described by taking an average of the spin-down and spin-up direct band gaps.…”

Section: Comparison Of Spectroscopies With Theorymentioning

confidence: 63%

“…[22][23][24][25][26] Of particular interest are the properties of EuN. 3,[27][28][29] The ground state of the Eu 3+ ion, the charge state anticipated when Eu bonds to nitrogen, has total angular momentum J = 0, so is non-magnetic. However, the separate spin and orbital angular momenta are both large, and thus it is possible that magnetic ordering could exist in the form of "hidden ferromagnetism".…”

mentioning

confidence: 99%

“…However, the separate spin and orbital angular momenta are both large, and thus it is possible that magnetic ordering could exist in the form of "hidden ferromagnetism". 27 Accurate calculations of the electronic structure have proven difficult; for example, an LSDA+U treatment that has been shown to be accurate for GdN 3,17 was unable to determine whether EuN has Eu in the 2+ or 3+ charge state, due to the presence of Eu 4f states close to the Fermi level. 3 Thus, even the fundamental question of whether EuN is metallic or semiconducting remains unsettled.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Electronic structure of EuN: Growth, spectroscopy, and theory

et al. 2011

View full text Add to dashboard Cite

We present a detailed study of the electronic structure of europium nitride (EuN), comparing spectroscopic data to the results of advanced electronic structure calculations. We demonstrate the epitaxial growth of EuN films, and show that in contrast to other rare-earth nitrides successful growth of EuN requires an activated nitrogen source. Synchrotron-based x-ray spectroscopy shows the samples contain predominantly Eu 3+ , but with a small and varying quantity of Eu 2+ that we associate with defects, most likely nitrogen vacancies. X-ray absorption and x-ray emission spectroscopies (XAS and XES) at the nitrogen K-edge are compared to several different theoretical models, namely LSDA+U (local spin density functional theory with Hubbard U corrections), dynamic mean field theory in the Hubbard-I approximation, and QSGW (quasiparticle self-consistent GW ) calculations. The DMFT and QSGW models capture better the density of conduction band states than LSDA+U . Only the Hubbard-I model contains a correct description of the Eu 4f atomic multiplets and locates their energies relative to the band states, and we see some evidence in XAS for hybridization between the conduction band and the the lowest lying 8 S multiplet. The Hubbard-I model is also in good agreement with purely atomic mutliplet calculations for the Eu M-edge XAS. LSDA+U and DMFT find a metallic ground state, while QSGW predicts a direct band gap at X for EuN of about 0.9 eV that matches closely an absorption edge seen in optical transmittance at 0.9 eV and a smaller indirect gap. Overall, the combination of theoretical methods and spectroscopies provides insights into the complex nature of the electronic structure of this material. The results imply that EuN is a narrow band-gap semiconductor that lies close to the metal-insulator boundary, where the close proximity to the Fermi level of an empty Eu 4f multiplet raises the possibility of tuning both the magnetic and electronic states in this system.

show abstract

Section: Comparison Of Spectroscopies With Theorymentioning

confidence: 63%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Electronic structure of EuN: Growth, spectroscopy, and theory

et al. 2011

View full text Add to dashboard Cite

show abstract

“…So far there have only been two published calculations on europium monopnictides, to our knowledge. As previously noted, Horne et al reported EuN to be half-metallic based on the SIC-LSDA method [71] and was confi rmed by Johannes and Pickett [91] using the LSDA+ U scheme. Following Johannes and Pickett [91], using the LSDA + U approach with U and J set as 8 and 1 eV respectively, we have obtained similar band structures for EuN and EuP, as shown in fi gure 12.…”

Section: Eu Monopnictidesmentioning

confidence: 66%

Electronic, magnetic and transport properties of rare-earth monopnictides

Duan

Sabirianov

Mei

et al. 2007

J. Phys.: Condens. Matter

189

152

View full text Add to dashboard Cite

The electronic structures and magnetic properties of many rare-earth monopnictides are reviewed in this article. Possible candidate materials for spintronics devices from the rare-earth monopnictide family, i.e. high polarization (nominally half-metallic) ferromagnets and antiferromagnets, are identifi ed. We attempt to provide a unifi ed picture of the electronic properties of these strongly correlated systems. The relative merits of several ab initio theoretical methods, useful in the study of the rare-earth monopnictides, are discussed. We present our current understanding of the possible half-metallicity, semiconductor-metal transitions, and magnetic orderings in the rare-earth monopnictides. Finally, we propose some potential strategies to improve the magnetic and electronic properties of these candidate materials for spintronics devices.

show abstract

“…The sensitivity of this Van Vleck susceptibility provides one means of detecting variation of the exchange coupling with pressure. [16] (iv) Other Related Work…”

Section: +mentioning

confidence: 99%

High-Pressure Thermodynamic Properties of f-electron Metals, Transition Metal Oxides, and Half-Metallic Magnets

Scalettar¹,

Pickett²

2004

View full text Add to dashboard Cite

A. SUMMARY OF PROJECT GOALSThis project involves research into the thermodynamic properties of f -electron metals, transition metal oxides, and half-metallic magnets at high pressure. These materials are ones in which the changing importance of electron-electron interactions as the distance between atoms is varied can tune the system through phase transitions from localized to delocalized electrons, from screened to unscreened magnetic moments, and from normal metal to one in which only a single spin specie can conduct. Three main thrusts are being pursued: (i) Mott transitions in transition metal oxides, (ii) magnetism in half-metallic compounds, and (iii) large volume-collapse transitions in f -band metals.

show abstract

Magnetic coupling between nonmagnetic ions:Eu3+in EuN and EuP

Cited by 69 publications

References 32 publications

Electronic structure of EuN: Growth, spectroscopy, and theory

Electronic structure of EuN: Growth, spectroscopy, and theory

Electronic, magnetic and transport properties of rare-earth monopnictides

High-Pressure Thermodynamic Properties of f-electron Metals, Transition Metal Oxides, and Half-Metallic Magnets

Contact Info

Product

Resources

About