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Thin superconducting films of Y-Ba-Cu-O withT
c0≊89 K have been prepared by the aerosol deposition method. The voltage current characteristic of microbridges (typically 10×10µm2) made from the finely granular films, which behave like a network of boundary Josephson junctions, is highly nonlinear...
We present the results of ground-state energies, radial distribution functions, liquid structure functions and effective interactions for a3He impurity in a4He background in two dimensions. The hypernetted-chain scheme for the system described by a Jastrow-type wavefunction is used, taking into...
We discuss a natural generalization of the uncertainty inequality holding in the case of non-hermitian operators. The inequality is employed to derive useful constraints on the behaviour of quantum fluctuations in problems with continuous group symmetries. Applications to Bose superfluids,...
Multiple spin echoes (MSEs) in3He and in3He-4He mixtures have been analyzed using a theoretical technique proposed by Einzel et al. In both systems MSEs are generated by Fermi liquid interactions, but for3He, MSEs are also generated at higher temperatures by the dipolar demagnetizing field. The...
Simultaneous measurements of the electrical resistivity ρ Seebeck coefficientS, and thermal conductivity k of URu2Si2 and UBe13 are carried out. For URu2Si2 a strong anomaly in the k(T) dependence near the temperature of the antiferromagnetic transition was observed. The thermal conductivity of...
The decay of the nonsingular doubly quantized vortex in3He-A into a pair of Mermin-Ho vortex textures in the immediate vicinity of the transition to theA
1phase is confirmed using the variational approach.
We have investigated the conductivity of surface state electrons on liquid4He films supported by a quench-condensed thin solid hydrogen substrate. A pronounced dip in the ac-conductivity was observed as the He film thickness reached about 10 layers. This phenomenon was studied at different...
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