Theory of orbital magnetic quadrupole moment and magnetoelectric susceptibility

Hydrogen atom in a magnetic field: quadrupole moment

Quadrupole moment of the hydrogen atom in a magnetic field B = 0– 4.414×10 G is calculated by two different methods. The first method is variational based on a single trial function. The second method deals with a solution of the Schrödinger equation in a form of a linear combination of the Landau orbitals. [email protected] 2 On leave of absence from the Institute for Theoretical and E...

Two Component Theory and Electron Magnetic Moment

The two-component formulation of quantum electrodynamics is studied. The relation with the usual Dirac formulation is exhibited, and the Feynman rules for the two-component form of the theory are presented in terms of familiar objects. The transformation from the Dirac theory to the two-component theory is quite amusing, involving Faddeev-Popov ghost loops of a fermion type with bose statistics...

Orbital period modulation and quadrupole moment changes in magnetically active close binaries

We discuss the main characteristics of the orbital period modulation in close binaries with late-type components. We focus on the various physical scenarios proposed to explain this phenomenon and, in particular, Hall’s (1989) suggestion that it may be connected with magnetic activity. Starting from the work of Applegate (1992) and Lanza et al. (1998a), we develop an integral approach to evalua...

Temperature-dependent orbital-moment anisotropy in dilute magnetic oxides

Is the magnetic anisotropy proportional to the orbital moment?