163 citations · 897 across the 15 of their papers we have counts for
5 papers · 1 filter
Native defects, hydrogen impurities, and metal dopants in CeO
Khang Hoang, Michelle D. Johannes
Ceria (CeO) is a material of significant technological importance. A detailed understanding of the material's defect physics and chemistry is key to understanding and optimizin…
Microscopic origin of magnetism and magnetic interactions in ferropnictides
M. D. Johannes, Igor Mazin
One year after their initial discovery, two schools of thought have crystallized regarding the electronic structure and magnetic properties of ferropnictide systems. One postulates…
SrCu(PO): A real material realization of the 1D nearest neighbor Heisenberg chain
M. D. Johannes, J. Richter, S. -L. Drechsler +1
We present evidence that crystalline Sr_2Cu(PO_4)_2 is a nearly perfect one-dimensional (1D) spin-1/2 anti-ferromagnetic Heisenberg model (AHM) chain compound with nearest neighbor…
Formation of an unconventional Ag valence state in Ag2NiO2
M. D. Johannes, S. Streltsov, I. I. Mazin +1
The Ag ion in the recently synthesized novel material Ag2NiO2 adopts an extremely unusual valency of 1/2, leaving the Ni ion as 3+, rather than the expected 2+. Using first princip…
Magnetic Coupling Between Non-Magnetic Ions: Eu3+ in EuN and EuP
M. D. Johannes, W. E. Pickett
We consider the electronic structure of, and magnetic exchange (spin) interactions between, nominally nonmagnetic Eu^3+ ions (4f^6, S=3, L=3, J=0) within the context of the rocksal…