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A system of equations resulting from an approximation of the equation of motion of Green functions for correlated electron systems is usually solved using Matsubara technique. In this work we propose an alternative method which works entirely along the real frequency axis. Using the example of...
In Part III of a three-part study, we report measurements of the thermal response, ΔT(ω), of
He mixtures to an ac heat flux, Q(t)=Q0eiωt. These data are for dilute concentrations, X, and they show the presence of three separate thermal resistances. One of these is the...
The properties of weakly coupled clean anisotropic (orthorhombic) superconductors with pure d and (d+s) pairing symmetry are considered. We derive analytical and universal results for generalized BCS-Mühlschlegel parameters like the zero temperature gap and the specific heat discontinuity at the...
We present a study of phase separation from supersaturated
He liquid mixtures at low temperatures addressing both the degree of critical supersaturation Δxcr
and the thermal-to-quantum crossover temperature T* for the nucleation process. Two different nucleation seeds are investigated,...
First we calculate the collective order parameter modes for the most promising candidates of spin-triplet p-wave pairing states in the layered perovskite structure of Sr
. The pairing interaction and accordingly the equations for the order parameter fluctuations are decomposed in terms...
Helium-3 and helium-4 can be used as surfactants to modify the observed wetting transitions of hydrogen and deuterium on rubidium. The effect of these surfactants on the wetting temperature is calculated. Prewetting induced by
He in H
on Rb is studied, and found to be re-entrant. Experiments...
Thermal conductivity has been measured from 0.03 K to 0.8 K in single crystal CeNi
which is quite near the quantum critical point (QCP). The Wiedemann–Franz law is observed at low temperatures (T<0.1 K) for both directions (j⊥c and j ∥ c), indicating that quasiparticles are scattered...
The dynamic structure factor, S(Q, ω), for wavevectors, 2.0≤Q≤3.6 Å
He in 95% porous aerogel has been measured by inelastic neutron scattering methods. The aerogel was grown with deuterated materials and the multiple scattering involving the aerogel was negligible. S(Q, ω) in the...
The energy of screw dislocations of a flux-line lattice in Type-II superconductors is calculated taking account of dispersion of the tilt modulus. On the basis of this calculation, the collective-pinning theory for the plastic case, proposed by Mullock and Evetts, leads to correlation lengths of...
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