Electron Correlations and the Minority-Spin Band Gap in Half-Metallic Heusler Alloys

Abstract

Electron-electron correlations affect the band gap of half-metallic ferromagnets by introducing non-quasiparticle states just above the Fermi level. In contrast to the spin-orbit coupling, a large asymmetric non-quasiparticle spectral weight is present in the minority-spin channel, leading to a peculiar finite-temperature spin depolarization effects. Using recently developed first-principle dynamical mean field theory, we investigate these effects for the half-metallic ferrimagnetic Heusler compound FeMnSb. We discuss depolarization effects in terms of strength of local Coulomb interaction $U$ and temperature in FeMnSb. We propose Ni${}_{1-x}$Fe${}_x$MnSb alloys as a perspective materials to be used in spin-valve structures and for experimental search of non-quasiparticle states in half-metallic materials.

arXiv comment5 pages, 3 figure

References in corpus (13)

• Spintronics: Fundamentals and applications
• Ab initio calculations of quasiparticle band structure in correlated systems: LDA++ approach
• First-principles Calculations of the Electronic Structure and Spectra of Strongly Correlated Systems: Dynamical Mean-field Theory
• Surface Properties of the Half- and Full-Heusler Alloys
• Electronic structure and magnetic properties of correlated metals: A local self-consistent perturbation scheme
• LDA++ approach to electronic structure of magnets: correlation effects in iron
• Nonquasiparticle states in half-metallic ferromagnet NiMnSb
• Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets
• Ab initio electronic structure calculation of correlated systems: EMTO-DMFT approach
• Tunable spin transport in CrAs: role of correlation effects
• Low temperature resistivity in a nearly half-metallic ferromagnet
• Magnon-assisted transport and thermopower in ferromagnet-normal metal tunnel junctions
• Spin-polarized scanning tunneling microscopy of half-metallic ferromagnets: Non-quasiparticle contributions

Cited by in corpus (36)

• Half-metallic ferromagnets: From band structure to many-body effects
• Role of the conduction electrons in mediating exchange interactions in Heusler alloys
• Spin-polarization and electronic properties of half-metallic Heusler alloys calculated from first-principles
• Substituting the main group element in cobalt - iron based Heusler alloys: Co${}_2$FeAl${}_{1-x}$Si${}_x$
• Thermal collapse of spin-polarization in half-metallic ferromagnets
• Non-quasiparticle states in Co${}_2$MnSi evidenced through magnetic tunnel junction spectroscopy measurements
• Influence of mixing the low-valent transition metal atoms (Y,Y${}^{\ast }$=Cr,Mn,Fe) on the properties of the quaternary Co${}_2$[Y${}_{1-x}$Y${}_x^{\ast }$]Z (Z=Al,Ga,Si,Ge,Sn) Heusler compounds
• Doping and disorder in the Co${}_2$MnAl and Co${}_2$MnGa half-metallic Heusler alloys
• Half-Metallic Ferromagnetism and the spin polarization in CrO${}_2$
• Thermodynamics of the Heusler alloy Co_2-xMn_1+xSi: a combined density functional theory and cluster expansion study
• A review of the electronic and magnetic properties of tetrahedrally bonded half-metallic ferromagnets
• Ab-initio calculation of the effective on-site Coulomb interaction parameters for half-metallic magnets
• Spintronic properties and stability of the half-Heusler alloys LiMnZ (Z=N, P, Si)
• Cubic MnSb: epitaxial growth of a predicted room temperature half-metal
• Model Hamiltonian parameters for half-metallic ferromagnets NiMnSb and CrO2
• Half-metallic ferromagnetism induced by dynamic electron correlations in VAs
• Engineering the electronic, magnetic and gap-related properties of the quinternary half-metallic Heusler alloys
• Better Band Gaps with Asymptotically Corrected Local Exchange Potentials
• Ab-initio determined electronic and magnetic properties of half-metallic NiCrSi and NiMnSi Heusler alloys; the role of interfaces and defects
• Effect of the double-counting functional on the electronic and magnetic properties of half-metallic magnets using the GGA+U method
• Ferrimagnetism and antiferromagnetism in half-metallic Heusler alloys
• Half-metallicity in NiMnSb: a Variational Cluster Approach with ab-initio parameters
• Majority-spin non-quasiparticle states in half-metallic ferrimagnet Mn${}_2$VAl
• Half-metallicity and magnetism in the Co${}_2$MnAl/CoMnVAl heterostructure
• Dispersive spectrum and orbital order of spinless p-band fermions in an optical lattice
• Electronic correlations in short period (CrAs)${}_n$/(GaAs)${}_n$ ferromagnetic heterostructures
• Absence of halfmetallicity in defect-free Cr, Mn-delta-doped Digital Magnetic Heterostructures
• Anomalously large spin-dependent electron correlation in nearly half-metallic ferromagnet CoS${}_2$
• Correlated electronic structure with uncorrelated disorder
• Spin-polarized ballistic conduction through correlated Au-NiMnSb-Au heterostructures
• Rare-earth impurities in Co${}_2$MnSi: an opportunity to improve Half-Metallicity at finite temperatures
• The half-metallic ferromagnet Co2Mn0.5Fe0.5Si
• Effects of Strong Interactions in a Half Metallic Magnet: a Determinant Quantum Monte Carlo Study
• Non-quasiparticle states in a half-metallic ferromagnet with antiferromagnetic $s-d(f)$ interaction
• Spectral properties of heterostructures containing half-metallic ferromagnets in the presence of local many-body correlations
• First-principles study of magnetic and spin-dependent transport properties of Mn2VZ (Z = Al, Ga) with negative spin polarization using a disordered local moment approach at finite temperatures