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The resonance spectra of coupled phonon–ripplon oscillations in two-dimensional electron crystals over liquid helium are measured at different driving electric potentials. The crystals with surface electron densities n
s = (3.2 − 12) × 108 cm−2 are studied at holding electric fields E
We solve the problem of phonon transmission through the interface between a quantum fluid with anomalous dispersion and a solid, for arbitrary angles of incidence. The Wiener–Hopf method is applied to solve the equations of the quantum fluid in the half-space, and in particular the solution is...
At very low temperatures, the tunnelling theory for amorphous solids predicts a thermal conductivity κ α Tm, with m = 2. However, most of the data in the literature in the temperature range 0.1–1 K report an m < 2. We want to show that this discrepancy often disappears for T→ 0 K. Here we report...
A series of YBa2-xNdxCu3Oy (x = 0–0.4) samples have been systematically studied by means of X-ray diffraction, transport property measurements and positron annihilation technology. The positron lifetime parameters show strong Nd substitution dependence. There is an obvious change of positron...
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