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Violation of the rule of parsimony: Mixed local moment and itinerant Fe magnetism in Fe 3 GeN
Ternary iron nitrides are of considerable interest due to their diverse magnetic properties. We find, based on first principles calculations, that the relatively minor structural distortion from the cubic antiperovskite structure in Fe$_3$GeN, consisting of octahedral rotations, leads to unusual magnetic behavior. In particular, there is a separation into Fe sites with very different magnetic behaviors, specifically a site with Fe atoms having a stable local moment and a site where the Fe shows characteristics of much more itinerant behavior. This shows a remarkable flexibility of the Fe magnetic behavior in these nitrides and points towards the possibility of systems where minor structural and chemical changes can lead to dramatic changes in magnetic properties. The results suggest that, analogously to oxide perovskite materials, modulation of magnetic properties via chemical or strain control of octahedral rotation may be feasible. Furthermore, this may then lead to approaches for tuning magnetism to realize properties of interest, for example tuning magnetic transitions to quantum critical regimes or to proximity to metamagnetic transitions of interest for devices.
Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He 4
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Large- N c and renormalization group constraints on parity-violating low-energy coefficients for three-derivative operators in pionless effective field theory
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Parity-violating deep-inelastic electron-deuteron scattering: Higher twist and parton angular momentum
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Large- N c limit reduces the number of independent few-body parity-violating low-energy constants in pionless effective field theory
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Time reversal invariance violating and parity conserving effects in proton-deuteron scattering
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Time-reversal-invariance-violating nucleon-nucleon potential in the 1 / N c expansion
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ψ ( 2 S ) versus J / ψ suppression in proton-nucleus collisions from factorization violating soft color exchanges
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Limits on R -parity violation in high-scale supersymmetry
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Lorentz- and C P T -violating standard model extension in chiral perturbation theory
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Accessible lepton-number-violating models and negligible neutrino masses
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