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Full-Text Articles in Physical Sciences and Mathematics
Longitudinal Nmr Relaxation Of Degenerate 2-D 3he In 4he Films, Robert Hallock, D. T. Sprague, N. Alikacem
Longitudinal Nmr Relaxation Of Degenerate 2-D 3he In 4he Films, Robert Hallock, D. T. Sprague, N. Alikacem
Robert Hallock
The NMR spin-lattice relaxation time T1 of a degenerate submonolayer coverage of 3He in a thin adsorbed 4He film has been measured. As a function of 4He coverage, T1 exhibits a maximum and undergoes a change in temperature dependence at a coverage near that of the superfluid transition in the underlying 4He film. Two relaxation mechanisms contribute to the observed T1.
Linear Tc Depression In Mg Doped Yba2cu3o7-X, Robert Hallock, W. M. Tiernan
Linear Tc Depression In Mg Doped Yba2cu3o7-X, Robert Hallock, W. M. Tiernan
Robert Hallock
We report resistivity-versus-temperature measurements performed on polycrystalline pellets of YBa2(Cu1-xMgx)3O7-δ made using the polymer-metal-complex precursor method. Tc was found to decrease linearly with increasing Mg doping in the range x=8.6×10-4 to 8.6×10-3 with slope -1400 K/x; the normal-state resistivity and the superconducting transition width showed little or no change. Mg was found to have a maximum solubility in YBa2(Cu1-xMgx)3O7-δ of x~=9×10-3.