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題名 Intrinsic anomalous Hall effect in nickel: A GGA + U study
作者 郭光宇
Fuh, Huei-Ru ; Guo, Guang-Yu
貢獻者 應物所
日期 2011.10
上傳時間 24-Jan-2014 12:53:04 (UTC+8)
摘要 The electronic structure and intrinsic anomalous Hall conductivity of nickel have been calculated based on the generalized gradient approximation (GGA) plus on-site Coulomb interaction (GGA + ) scheme. The highly accurate all-electron full-potential linearized augmented plane-wave method is used. It is found that the intrinsic anomalous Hall conductivity () obtained from the GGA + calculations with eV and eV is in nearly perfect agreement with that measured recently at low temperatures while, in contrast, the from the GGA calculations is about 100 larger than the measured one. This indicates that, as for the other spin-orbit interaction (SOI)-induced phenomena in 3 itinerant magnets, such as the orbital magnetic magnetization and magnetocrystalline anisotropy, the on-site electron-electron correlation, though moderate only, should be taken into account properly in order to get the correct anomalous Hall conductivity. The intrinsic and the number of valence electrons () have also been calculated as a function of the Fermi energy (). A sign change is predicted at eV (), and this explains qualitatively why the theoretical and experimental values for Fe and Co are positive. It is also predicted that fcc NiCo(Fe,Cu) alloys with being small would also have the negative with the magnitude being in the range of 500–1400 cm. The most pronounced effect of including the on-site Coulomb interaction is that all the -dominant bands are lowered in energy relative to the by about 0.3 eV, and consequently, the small minority spin hole pocket disappears. The presence of the small hole pocket in the GGA calculations is attributed to be responsible for the large discrepancy in the between theory and experiment.
關聯 Physical Review B, 84(14), 144427
資料來源 http://link.aps.org/doi/10.1103/PhysRevB.84.144427
資料類型 article
DOI http://dx.doi.org/10.1103/PhysRevB.84.144427
dc.contributor 應物所en_US
dc.creator (作者) 郭光宇zh_TW
dc.creator (作者) Fuh, Huei-Ru ; Guo, Guang-Yuen_US
dc.date (日期) 2011.10en_US
dc.date.accessioned 24-Jan-2014 12:53:04 (UTC+8)-
dc.date.available 24-Jan-2014 12:53:04 (UTC+8)-
dc.date.issued (上傳時間) 24-Jan-2014 12:53:04 (UTC+8)-
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/63543-
dc.description.abstract (摘要) The electronic structure and intrinsic anomalous Hall conductivity of nickel have been calculated based on the generalized gradient approximation (GGA) plus on-site Coulomb interaction (GGA + ) scheme. The highly accurate all-electron full-potential linearized augmented plane-wave method is used. It is found that the intrinsic anomalous Hall conductivity () obtained from the GGA + calculations with eV and eV is in nearly perfect agreement with that measured recently at low temperatures while, in contrast, the from the GGA calculations is about 100 larger than the measured one. This indicates that, as for the other spin-orbit interaction (SOI)-induced phenomena in 3 itinerant magnets, such as the orbital magnetic magnetization and magnetocrystalline anisotropy, the on-site electron-electron correlation, though moderate only, should be taken into account properly in order to get the correct anomalous Hall conductivity. The intrinsic and the number of valence electrons () have also been calculated as a function of the Fermi energy (). A sign change is predicted at eV (), and this explains qualitatively why the theoretical and experimental values for Fe and Co are positive. It is also predicted that fcc NiCo(Fe,Cu) alloys with being small would also have the negative with the magnitude being in the range of 500–1400 cm. The most pronounced effect of including the on-site Coulomb interaction is that all the -dominant bands are lowered in energy relative to the by about 0.3 eV, and consequently, the small minority spin hole pocket disappears. The presence of the small hole pocket in the GGA calculations is attributed to be responsible for the large discrepancy in the between theory and experiment.en_US
dc.format.extent 326974 bytes-
dc.format.mimetype application/pdf-
dc.language.iso en_US-
dc.relation (關聯) Physical Review B, 84(14), 144427en_US
dc.source.uri (資料來源) http://link.aps.org/doi/10.1103/PhysRevB.84.144427en_US
dc.title (題名) Intrinsic anomalous Hall effect in nickel: A GGA + U studyen_US
dc.type (資料類型) articleen
dc.identifier.doi (DOI) 10.1103/PhysRevB.84.144427en_US
dc.doi.uri (DOI) http://dx.doi.org/10.1103/PhysRevB.84.144427en_US