Magnetism in Co-doped tris-8-hydroxyquinoline aluminum studied by first-principles calculations

Fenggong Wang; Zhiyong Pang; Liang Lin; Shaojie Fang; Ying Dai; Shenghao Han
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053304
Academic Journal
The electronic and magnetic properties of Co-doped tris-8-hydroxyquinoline aluminum (Alq3) are studied by first-principles calculations. Our results indicate that the local magnetic moments in doped Alq3 originate from the localized d states of Co atom. Electron transfer takes place from Co atom to Alq3 molecule, which is mainly localized on the quinolate ligand, resulting in formation of bound magnetic polarons. The indirect ferromagnetic exchange interaction between two bound magnetic polarons antialigning with the same magnetic ion promotes the collective magnetism found in recent experiments.


Related Articles

  • Charge gaps and quasiparticle bands of the ionic Hubbard model. Jabben, T.; Grewe, N.; Anders, F. B. // European Physical Journal B -- Condensed Matter;Mar2005, Vol. 44 Issue 1, p47 

    The ionic Hubbard model on a cubic lattice is investigated using analytical approximations, the DMFT and Wilson�s renormalization group for the charge excitation spectrum. Near the Mott insulating regime, where the Hubbard repulsion starts to dominate all energies, the formation of...

  • Thickness dependence of magnetic and transport properties in organic-CoFe discontinuous multilayers. Wang, W. X.; Wang, Y. P.; Zhang, X. -G.; Wang, Y.; Jin Zou; Han, X. F. // Journal of Applied Physics;May2010, Vol. 107 Issue 9, p09E307-1 

    Spin-dependent transport measurement in 3-hexadecyl pyrrole (3HDP) with a CoFe layer and the current-in-plane geometry is reported. Transport properties indicate the CoFe layers are discontinuous when their thicknesses are smaller than 6 nm. The temperature dependence of the conductance suggests...

  • Magnetopolaron State of Particles in Quantum Rings of Finite Width. Kovalev, V. M.; Chaplik, A. V. // Journal of Experimental & Theoretical Physics;Oct2005, Vol. 101 Issue 4, p686 

    The energies of the electron and hole weak-coupling polarons are determined in quantum rings of finite width in a uniform magnetic field. It is shown that polaron corrections exhibit oscillatory behavior as a function of a magnetic field. The effect of polaron corrections on the absorption and...

  • On formation of long-living states. Ivlev, Boris I. // Canadian Journal of Physics;Dec2016, Vol. 94 Issue 12, p1253 

    The motion of a particle in a potential well is studied when the particle is attached to an infinite elastic string. This is generic with the problem of dissipative quantum mechanics investigated by Caldeira and Leggett (Ann. Phys. 149, 374 (1983). doi:). Besides the dissipative motion there is...

  • Low-lying states in 195Pt described by the particle-rotor model. Petkov, P.; von Brentano, P.; Jolie, J. // European Physical Journal A -- Hadrons & Nuclei;Jan2006, Vol. 27 Issue 1, p53 

    Particle plus triaxial rotor model calculations have been performed for the negative-parity states in 195Pt. An overall reasonable description of the level energies below 700 keV and of the corresponding B( E2) and B( M1) transition strengths was obtained. The doublet structure of the levels may...

  • A Quantum Spin Liquid in a Two-Layer Triangular Antiferromagnet. Gekht, R. S.; Bondarenko, I. N. // Journal of Experimental & Theoretical Physics;Nov2005, Vol. 101 Issue 5, p868 

    The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a transition from the classical state with 120° triangular order to a...

  • Electron gas in the screening-corrected Hartree-Fock model. Poluektov, Yu. // Russian Physics Journal;Dec2004, Vol. 47 Issue 12, p1229 

    An exact solution has been obtained for the quasiparticle dispersion law and total energy in the framework of the Hartree-Fock model applied to the case of screened Coulomb interaction. It has been shown that if screening is taken into account, the predicted density of states and effective mass...

  • Theory of the Spin-Polaron for 2D Antiferromagnets. Barabanov, A. F.; Maksimov, L.A.; Mikheyenkov, A. V. // AIP Conference Proceedings;2000, Vol. 527 Issue 1, p1 

    The aim of these lectures is to describe theoretical ideas concerning spin-polaron scenario for the charged excitations in a two-dimensional antiferromagnet in normal state. The distinctive feature of our approach consists in treating a local polaron (not a bare hole) as a zero approximation for...

  • Two-site model for a small polaron: Mass renormalization and optical conductivity. Yavidov, B. // Journal of Experimental & Theoretical Physics;Jun2009, Vol. 108 Issue 6, p1019 

    The renormalization of the mass of an electron interacting with many ions of a lattice via the long-range (Fröhlich) electron-phonon interaction and optical absorption of electrons are studied at zero temperature. Ions are assumed to be isotropic three-dimensional oscillators. The optical...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics