Magnetic Moments Of Conduction Electrons Research Articles

Spin current polarization and electrical conductivity in metal helimagnets

The peculiarities of spin and charge kinetics in helical magnetic metals that are due to forces acting on the magnetic moment of conduction electrons in inhomogeneous magnetic field have been considered. Analyzing the equations of motion for non-equilibrium spin density shows that an electric field directed along the axis of the helix produces conduction-electron spin polarization along this direction. Under the same conditions, the directions of polarization of the spin current and polarization of the locally equilibrium spin density are collinear. The specific structure of the effective exchange field acting on the conduction electrons in helical magnets causes two additional spin relaxation mechanisms to emerge. In addition to the mechanism of spin-lattice relaxation, “diffusion” and “precession” mechanisms of spin relaxation exist in conductive helical magnets. The diffusion mechanism is analogous to the Dyakonov-Perel spin relaxation mechanism. The key point is that the inhomogeneities of a magnetic field initiate a coupling between the spin and charge systems. It has been shown that, in a helical metal, the electrical conductivity decreases due to the action of the non-uniform exchange magnetic field.

Successive superconducting transitions and Anderson localization effect inTa2S2C

A complex carbide Ta$_{2}$S$_{2}$C consists of van der Waals (vdw)-bonded layers with a stacking sequence $...$ C-Ta-S-vdw-S-Ta-C- $...$ along the c axis. The magnetic properties of this compound have been studied from DC and AC magnetic susceptibility. Ta$_{2}$S$_{2}$C undergoes successive superconducting transitions of a hierachical nature at $T_{cl} = 3.61 \pm 0.01$ K [$H_{c1}^{(l)}(0) = 28 \pm 2$ Oe and $H_{c2}^{(l)}(0) = 7.7 \pm 0.2$ kOe] and $T_{cu} = 9.0 \pm 0.2$ K [$H_{c2}^{(u)}(0) = 6.0 \pm 0.3$ kOe]. The intermediate phase between $T_{cu}$ and $T_{cl}$, where $\delta \chi (= \chi_{FC} - \chi_{ZFC}) \approx 0$, is an intra-grain superconductive state occurring in the Ta-C layers in Ta$_{2}$S$_{2}$C. The low temperature phase below $T_{cl}$, where $\delta \chi$ clearly appears, is an inter-grain superconductive state. The magnetic susceptibility at $H$ well above $H_{c2}^{(l)}(0)$ is described by a sum of a diamagnetic susceptibility and a Curie-like behavior. The latter is due to the localized magnetic moments of conduction electrons associated with the Anderson localization effect, occurring in the 1T-TaS$_{2}$ type structure in Ta$_{2}$S$_{2}$C.

Kondo anomalies in electron paramagnetic resonance in dilute magnetic alloys

The influence of the electron bottleneck effect, i.e., the dynamic nature of the interaction between spin subsystems of localized moments and conduction electrons on the Kondo effect in EPR parameters of dilute magnetic alloys in investigated. The results are obtained by solving a coupled system of equations for transverse dynamic susceptibilities of localized magnetic moments and magnetic moments of conduction electrons. Calculations are based on Feynman’s diagram technique and on the pseudofermion representation of localized spin operators. Experimental data are discussed.

Evidence for Magnetic Coupling in the Thermal Boundary Resistance between LiquidHe3and Platinum

The first measurements are reported showing that the thermal boundary resistance between a metal and liquid $^{3}\mathrm{He}$ depends on the applied magnetic field. The resistance, which is not affected by pressure changes or superfluidity of the liquid, is insensitive to fields less than 2 kG, but increases by a factor of 3 when the field is increased to 8 kG. The experimental results are explained by a model which assumes that the thermal transfer between the Pt and $^{3}\mathrm{He}$ is due to a magnetic coupling between the magnetic moments of conduction electrons in the metal and the nuclear spins of the solid $^{3}\mathrm{He}$ layer on the Pt surface.

Asphericity of the 3d Magnetic Moment Distribution and Conduction Electron Polarization in Co–Fe Alloys

AbstractInvestigations of magnetic form factors of Co–Fe (f.c.c.) alloys by polarized neutrons are described. It is shown that the asphericity of the spin‐density distribution and the magnetic moment of conduction electrons increases with the iron content. Both results are discussed in terms of the existing theories of magnetism in transition metals. The results obtained for the most heavily doped sample, Co0.86F0.14, indicate on the existence of the iron‐iron interaction which probably leads to a change of the electronic structure of iron.

Electric dipole and quasi-orbital magnetic moments of conduction electrons

Electric dipole and quasi-orbital magnetic moments of conduction electrons

Effect of Electron Spin Paramagnetism on the Velocity of Sound in Metals

Increase of sound velocity in metals due to external magnetic field interaction with magnetic moment of conduction electrons

The magnetic moment of conduction electrons in A III B V compounds

The magnetic moment of conduction electrons in A III B V compounds

Hyperfine interaction due to orbital magnetic moment of electrons with large g factors

The hyperfine interaction due to the orbital magnetic moment of conduction electrons is investigated. The effect can be split into two parts. One part is due to the long-range component of the interaction and it depends only on the macroscopic properties of the solid, i.e. on the magnetic susceptibility. This part depends on the shape of the sample via the demagnetizing factors; its magnitude is small, but the effect may be observable in a substance with very large g factor. The second part arises from the short-range component of the interaction and is the analogue of the atomic orbital hyperfine interaction; it reduces to it when the atoms are separated.