On the theory of superfluidity of helium II near the ? point

Boundary conditions in the macroscopic theory of superconductivity

“…Условия применимости раз ложения (6), по видимому, совпадают с условиями применимости разложения (1), а сам такой способ учета поверхностного вклада был предложен в [7], см. также [3,8,9].…”

Use of the modified Ginzburg–Landau equations in high temperature superconductors

“…The Maxwell equation should be added to these formulas, i.e., div B = 0 (7,3) The boundary conditions at the surfaces of the superconductor for the MGL equations are…”

“…Because of this, the mean-field theory was not able to explain the reason of other second-order phase transitions, e.g., superfluidity helium, liquid crystals, etc. Theoretically the range of temperature around T c and within which the fluctuations are effective, for pure SC, is ξ~ d. In this theory, the GL free energy functional for the order parameter and with modified temperature dependence of the coefficients was taken as the effective Hamiltonian [7,8]. Several works, therefore, stressed on the possibility of using the same modified GL theory for the case of HTS [9][10][11][12].…”

Cryogenic design of the liquid helium experiment Critical Dynamics in Microgravity

“…Unlike solid systems which, even in the high-purity limit support vacancies and grain boundaries, 'He near its superfluid wansirion is homogeneous. According to the Psi Theory [5], superfluid helium can be described by a two-component order parameter, often referrea to as the "wavefunction of the condensate." In most critical phenomena studies, the field conjugate to the order parameter creates a rounding of the transition.…”