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A new method for the accurate determination of smallchanges in the Dingle temperature measured in the de Haas-van Alphen effect is described. The method is illustrated with some measurements in copper and potassium, in which changes in the Dingle temperature of only a few millikelvin could be...
The theory of charge-transfer biexciton spectra of molecular crystals is generalized to include the specific case where the organic crystal contains two molecules (atoms) per unit cell. Using the effective Hamiltonian derived in our previous study, the excitation spectrum is calculated in the...
The flux flow resistivity ρ
has been investigated in the range of reduced temperature 0.5–0.99 for indium thin films having the properties of dirty, type II superconductors. In this temperature range ρ
was found to show a linear dependence on magnetic field strength for low values of the...
We determine a gauge allowing the order parameter to be real in the mixed state of type II superconductors although flux quantization is respected. The Ginzburg-Landau equations written in this peculiar gauge are then derived to obtain a new formulation of the vortex line free energy. The result...
Making use of a technique developed by Hu, Kumar, and Maki, we calculate the energies associated with linear singularities, such as vortex lines and disgyrations, and linear structures, such as the Mermin-Ho (MH) and Anderson-Toulouse (AT) structures in superfluid3He-A. The results are used to...
The effects of a magnetic field on nuclear spin ordering in solid3He have been observed through the influence of the field on the solid entropy. By making use of the Clausius-Clapeyron equation, the3He melting temperature as a function of pressure was determined in several magnetic fields from 0...
Results are presented for electron tunneling studies of superconducting lead-indium alloys (Pb0.88In0.12 and Pb0.64In0.36) as a function of pressure. The pressure dependence of the energy gap Δ0, the reduced energy gap 2Δ0/kTc, and the electron-phonon coupling constant λ show that under pressure...
We present a theoretical model able to describe the occurrence of localized magnetism in disordered systems such as A
Ac, where A and B are two transition elements and Ac is an actinide impurity. The disordered host is treated within the coherent potential approximation (CPA); thed level...
The shear viscosity η(T) in the Balian-Werthamer (BW) state of superfluid
He is calculated variationally throughout the region 0≤t≤ 1(t=T/T
c) from the transport equation for Bogoliubov quasiparticles. Coherence factors are treated exactly in the calculation of the collision integral. The...
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