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We report inversion of population between the ortho and para states of hydrogen at very low temperature with homogeneous external magnetic field. At low temperature, one needs to apply very high magnetic fields to get this population inversion when ortho states will be more populated than the...
It is found that when two micro/nano-scale tubes of different areas of cross sections filled with identical Fermi gas are connected to each other and the two junctions are kept at different temperatures, the finite-size effect will result in the “thermosize effects”, which are analogous to...
We report studies of solid helium contained inside a torsional oscillator, at temperatures between 1.07 K and 1.87 K. We grew single crystals inside the oscillator using commercially pure 4He and 3He-4He mixtures containing 100 ppm 3He. Crystals were grown at constant temperature and pressure on...
Based on a coordinate transformation, we first change the boundary potential of a quantum rod from the ellipsoidal form into a spherical one. And then the properties of the vibrational frequency and the ground state binding energy of a strongly-coupled impurity bound polaron in it are studied....
Adsorption inside a slit pore of flexible width w is explored, with a focus on how w varies as a function of the external pressure P of a gas in equilibrium with the adsorbate within the pore. The analysis is first carried out in general, using a minimization of the thermodynamic grand potential...
We have produced the (BiPb)2V
with x=0.1 and y=0.050,0.10,0.2 and 0.3 compounds by melt-quenching method. Structural and superconducting properties of the produced samples were investigated by Scanning Electron Microscopy, X-ray diffraction patterns, electrical...
We report on experimental investigations of acoustic emission by quartz tuning forks resonating at frequencies 32 kHz, 38 kHz, 77 kHz and 100 kHz immersed in cold gaseous 4He and its normal and superfluid liquid phases. Frequency dependence of the observed low-drive-linewidth at 350 mK together...
The thermal properties of single crystalline Dy2Ti2O7 have been studied in a temperature range from 0.3 K to 30 K and magnetic fields applied along  direction up to 1.5 T. Based on a thermodynamic field theory various heat relaxation and thermal transport measurements were analysed. So we...
The year 2011 is quite remarkable because it allows us to celebrate not only the centennial of the discovery of superconductivity by Heike Kamerlingh-Onnes (The superconductivity of Mercury, Comm. Phys. Lab. Univ. Leiden, vols. 122, 124, 1911), but also the half-centennial of the discovery of...
Measurements of the order parameter texture of rotating superfluid 3He-B have been performed as a function of the applied azimuthal counterflow velocity down to temperatures of 0.2 T
c. The results are compared to the hydrostatic theory of 3He-B. Good agreement is found at all measured...
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