D. Davidov

Electron spin resonance of Er in cubic metals: Th:Er, Rh:Er, Pt:Er and Cu:Er☆

Abstract The first observation of the electron paramagnetic resonance of Th:Er, Rh:Er, Pt:Er and Cu:Er is reported. A comparison of the exchange interaction between the Er and the conduction electrons in the noble metals Cu, Ag and Au is given.

Electron spin resonance of Er in high susceptibility metals

Abstract The magnetic resonance of Er in dilute Pt and Pd based alloys is reported. Large negative g shifts in both hosts are inferred from the systematics of the hyperfine coupling, and the proportionality of Er and Gd g shifts to the host metal susceptibility of Pt, Pd and Rh alloys.

Paramagnetic resonance of a non S-state localized moment in metal: Ag: Dy

Abstract The first observation of the magnetic resonance of dysprosium in a metal ( Ag : Dy) is reported. The properties of the resonance can be understood in terms of a 4f 9 configuration, Russell-Saunders-Hundrule ground level, in the presence of a cubic crystalline field. A value for the localized-conduction electron exchange coupling J = 0.25 ± 0.1 eV in Ag :Dy is extracted from the temperature dependence of the resonance linewidth.

Correlation between electron spin resonance and superconductivity in GdxB1−xRu2 (B=Th, Ce, La)☆

Abstract Correlation between EPR and superconductivity in Gd x B 1− x Ru 2 (B=Th, Ce, La) enables us to interpret the behavior of the superconducting transition temperature as a function of Gd concentration in these cubic intermetallic compounds.

He3 cold finger cryostat for epr experiments

Abstract : Recently, the authors have been able to control and measure the temperature dependence of the X-band Electron Spin Resonance (ESR) of localized moments in metals. The measurements were performed continuously from temperature of 0.52 to 35K. (limited only by the signal to noise). This paper describes the experimental arrangement used for these measurements. (Modified author abstract)

Re-entrant critical field behavior in GdxTh1−xRu2: Correlation with EPR☆

Abstract The correlation between re-entrant critical field behavior and the EPR g shift enables us to estimate the conduction electron spin orbit scattering for the system GdxTh1−xRu2

Electron spin resonance of Dy and Er in Ir

Abstract The electron spin resonance of Er and Dy in Ir is reported. The exchange interaction between the localized moment and the conduction electrons is separated into f-d and f-s character, and estimates are given for its component magnitudes.

Conduction Electron Spin Flip Scattering in LaAl2 Doped with Gd, Ce, Th and U Impurities

Electron spin resonance measurements on Gd in LaAl2 exhibit appreciable changes in the g value and linewidth upon 1) changing the Gd concentration, 2) introducing Kondo‐like impurities in place of La (e.g. Ce), 3) introducing non‐magnetic impurities in place of La (e.g. Th), and 4) introducing “fluctuation moments” in place of La (e.g. U). These changes are interpreted in terms of the magnetic resonance bottleneck, allowing for the extraction of the spin flip lattice scattering rate δeL of the conduction electrons in all four categories. We find (in units of 107 sec−1 per ppm) ∂δeL/∂c = 1±0.6 (Gd), 7±3 (Ce), 5±2 (Th), and  20±8(U). We attribute the very much larger cross section for Ce and U, as compared to Gd and Th, respectively, to the proximity of the 4f and 5f resonance levels to the Fermi level. This allows for large admixtures, leading to rapid spin‐orbit relaxation of the conduction electron spin.

Electron Spin Resonance of Gd in LuAl2

Electron spin resonance spectra of Gd in LuAl2 exhibit significant changes in g shift (Δg) and thermal broadening of the linewidth, (ΔH/ΔT) upon a) varying the concentration of magnetic impurity (Gd); b) adding a second non‐magnetic impurity (Th); and c) lowering the temperature (down to 0.52°K). By reducing the Gd concentration from 2% to 20 ppm we were able to shift the g value and thermal broadening from Δg≃0 and ΔH/ΔT (20±3) G/°K to Δgo=+0.085±0.005 and (ΔH/ΔT)k=(75±10) G/K. The same effect was found by adding Th as a second impurity. Both the g shift and the thermal broadening show appreciable temperature dependence in the range of 0.52<T<6°K. The results are interpreted in terms of Hasegawas theory for bottleneck and dynamic effects, where the g shift and linewidth can be written as follows: Δg = (δeL/δei)2(1+δeL/δei)2 + (γλχiH/δei)2 Δgo ΔH = (1+δeL/δei) + (γλχiH/δei)2(1+δeL/δei)2 + (γλχiH/δei)2 (δeL/δei) (ΔHΔT)k T Assuming that the exchange interaction Jfs does not depend heavily on the conduction...

Electron Spin Resonance of Gd in

Electron spin resonance spectra of Gd in LuAl2 exhibit significant changes in g shift (Δg) and thermal broadening of the linewidth, (ΔH/ΔT) upon a) varying the concentration of magnetic impurity (Gd); b) adding a second non‐magnetic impurity (Th); and c) lowering the temperature (down to 0.52°K). By reducing the Gd concentration from 2% to 20 ppm we were able to shift the g value and thermal broadening from Δg≃0 and ΔH/ΔT (20±3) G/°K to Δgo=+0.085±0.005 and (ΔH/ΔT)k=(75±10) G/K. The same effect was found by adding Th as a second impurity. Both the g shift and the thermal broadening show appreciable temperature dependence in the range of 0.52<T<6°K. The results are interpreted in terms of Hasegawas theory for bottleneck and dynamic effects, where the g shift and linewidth can be written as follows: Δg = (δeL/δei)2(1+δeL/δei)2 + (γλχiH/δei)2 Δgo ΔH = (1+δeL/δei) + (γλχiH/δei)2(1+δeL/δei)2 + (γλχiH/δei)2 (δeL/δei) (ΔHΔT)k T Assuming that the exchange interaction Jfs does not depend heavily on the conduction...