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Flux pinning in the region of low perpendicular magnetic fields is shown to take place at the edge of granular Al films, by using external magnetic fields with spatial gradients. Both the temperature and magnetic field dependences of depinning currents due to edge pinning were measured. The...
Amorphous superconductors exhibit very large values of the Ginzburg-Landau parameter κ due to the small electronic diffusivity characteristic of these materials. Measurements of both the upper and lower critical fields H
c2 and H
c1 have been made in an effort to characterize the properties of...
The magnetization of very dilute Al-Mn and Al-Fe alloys was measured from 2 to 0.01 K in order to obtain a limit on how nonmagnetic such systems are. Results indicate that the impurity contribution to the magnetization is almost temperature independent and that the moment per impurity is less...
The desorption heat capacity of successive monolayers of 3He adsorbed on solid neon is measured and a rigid band model for the desorption is set up. The agreement between experiment and theory is good. The desorption energy varies between 55 and 25 K for the first layer as a function of coverage...
We have implanted Sn, Ge, and Si into Nb films. The resulting Nb-Sn compounds and their annealing behavior have been analyzed by the Mössbauer effect and compared to samples obtained by diffusion of Sn into Nb foils. Mössbauer spectra show that Nb3Sn is obtained just by implantation, but with a...
Two types of anomalous behavior of radiofrequency size effect (RFSE) signals arising from the second-zone hole surface of indium have been observed. Both anomalies can be explained in terms of the overlapping of RFSE signals and can be resolved by slightly tilting the magnetic field with respect...
From the nonlocal GLAG theory expressions are derived for x1 and x2 of a clean, cubic crystal with a general Fermi surface. In the region of weak nonlocality near T
cthe correction terms in H
c2, x1, and x2 due to the nonspherical Fermi surface are expressed by two dimensionless Fermi surface...
Evidence that the positive ion in liquid 4He forms a solid core with a solid-liquid interface is examined in the light of new analytic solutions to the Navier-Stokes equations. It is found that the existing evidence does not decisively favor the picture that a solid core is formed.
The thermal expansion, magnetization, magnetostriction, and ac electrical resistance of the compound ErRh4B4 have been measured at low temperatures. The influence of magnetic fields on the superconducting and magnetic properties of this compound is emphasized, and the qualitative behavior of the...
The present work is an extension and generalization of recent work on the very-low-temperature properties of antiferromagnetic, Ising-like, spin-1/2 systems in their parallel magnetic field-configuration paramagnetic phase. Here, their perpendicular-field configuration will be explored together...
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