Showing papers by "Sheldon Schultz published in 1985"

ESR in a heavy-fermion alloy (UBe13) doped with local moments.

Abstract: We have determined the ESR properties of UBe13 doped with dilute local moments of Er, Dy, or Gd over the temperature region where there is a large variation in the enhanced specific heat. We find that neither the enhancement, the temperature variation, nor any other anomalous behavior appears to be mirrored in the ESR data. We suggest that this unexpected result must be incorporated into current models of heavy-fermion systems. © 1985 The American Physical Society.

Measurement of conduction-electron spin relaxation due to rare gases physisorbed on a lithium surface.

Abstract: The conduction-electron spin-scattering cross sections of krypton and xenon atoms adsorbed on a lithium surface were determined by measurement of the conduction-electron spin-resonance linewidth of lithium films as a function of rare-gas coverage. The results indicate that there is a large pileup of conduction-electron density deep within the rare-gas adsorbate core, in agreement with current theoretical calculations of the electronic structure of rare-gas-on-metal systems.

Dependence of the magnetic properties of the spin‐glass Ag‐Mn on the addition of magnetic impurities

Abstract: We have measured the dc magnetization, electron spin resonance (ESR) linewidth and ESR line shift δHr for the spin‐glass Ag‐Mnx (x=4 and 8 at. %) as a function of adding magnetic impurities (Er and Gd). We determine the anisotropy constant from the relation K=δHrM0, where M0 is the magnetization measured at the dc field corresponding to g=2 resonance. We find that the addition of Er systematically changes α, the slope of the linear dependence of the anisotropy constant, i.e., K(T)=K(0)(1−αT/Tc), such that α approaches unity at high‐impurity concentration. The addition of Gd produces a reduction of M0 which results in values for K(T) which are nearly independent of concentration. We have measured the dependence of the dc magnetization cusp temperature Tg as a function of the concentration of the various impurities, and have also studied the remanent magnetization as a function of time, temperature, and field.