1 - 10 of 81 articles
Superfluid 3He-A shares the properties of spin nematic and chiral orbital ferromagnet. Its order parameter is characterized by two vectors
. This doubly anisotropic superfluid, when it is confined in aerogel, represents the most interesting...
We consider theoretically static and dynamic properties of multicomponent Bose–Einstein condensates (BECs) composed of a mixture of 174Yb and 176Yb atoms. The condensate of 176Yb atoms has an attractive interaction, collapsing above a certain critical particle number. This criterion is modified...
Measurements of thermal conductivity of solid methane-deuteromethane solutions at equilibrium vapor pressure in the temperature range 1.2÷20 K are reported. The obtained dependences of thermal conductivity on temperature and concentration can be explained qualitatively assuming that the dominant...
The Kosterlitz-Thouless (KT) transition in two-dimensional BEC systems is calculated taking into account the fact that in experiments these are finite-size systems. The outer boundaries of the condensate effectively act as hard walls, and this has a polarizing effect on the vortex pairs of the...
We have studied heat capacities of 4He adsorbed in straight nanopores 1.8, 2.2, and 2.8 nm in diameter. Heat capacities of the 4He fluid film on the solid layer at 0.08–0.4 K show power laws close to T in 1.8 nm pores, close to T
2 in 2.8 nm pores, and a crossover from T to T
2 with increasing...
A scanning probe microscope working at low temperatures is developed. Frequency-modulation atomic force microscopy technique with a quartz tuning fork is employed for low temperatures use. Topographic imaging of a diffraction grating is successfully performed down to 1.3 K.
Two dimensional anti-ferromagnetic solid 3He on graphite in the so called 4/7 phase is a highly frustrated quantum spin system and its ground state is considered to be a gapless spin liquid. To investigate the detailed magnetic behavior, the magnetization curve has been measured below 1 mK in...
Equilibrium shape of the interface between superfluid and crystalline 4He near the (0001) orientation is analyzed. We observe a singular dependence of the contact angle on the wall inclination with respect to the gravity. The energy of a step on the basal plane is measured. From the analysis of...
In the framework of the “ULTIMA” project, we use ultra cold superfluid 3He bolometers for the direct detection of single particle events, aimed for a future use as a dark matter detector. One parameter of the pulse shape observed after such an event is the thermalization time constant τ
We report a preliminary study of heat capacities of 4He confined in a nanoporous Gelsil glass that has nanopores of 2.5 nm in diameter. The heat capacity has a broad peak at a temperature far above the superfluid transition temperature obtained by torsional oscillator technique. The...
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