Robert Collyer

Robert Collyer
Louisiana State University | LSU · Department of Physics & Astronomy

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3
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16
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Publications

Publications (3)
Article
Full-text available
We explored the anomalously low moment in MnSi found by experiment (~0.4 $\mu_{\text{B}}$/Mn) vs the moment predicted by density functional theory (~1.0 $\mu_{\text{B}}$/Mn). With the addition of a Hubbard-U correction, we found several solutions with lower moments. These lower moment solutions show an unusual magnetic order and a magnetic quadrupo...
Article
We have investigated the origin of the anomalously low measured moment of MnSi (0.4μB/Mn) when compared to DFT calculations (1.0μB/Mn) by adding a Hubbard-U. By treating the Hubbard-U as an adjustable parameter, we have found two ground state solutions. For low values of U, a high-moment solution is energetically favored with μ≈1.0μB/Mn. For , the...
Article
MnSi is a metallic helimagnet below 29 K. Density functional theory predicts that it has a moment of 1.0 muB/Mn, which is much larger than the measured value of 0.4 muB/Mn. By adding a Hubbard-U correction, we have found a ground state with a moment consistent with the experimental value. These solutions posess a novel quadrupolar spin ordering. We...

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