2012/06/07 by В. Б. Бобров, V. B. Bobrov, Bobrov, V. B. +2
Engineering · Physics and Astronomy · #FOS: Physical sciences #Other Condensed Matter (cond-mat.other) #Quantum, superfluid, helium dynamics #Spacecraft and Cryogenic Technologies #Statistical Mechanics (cond-mat.stat-mech) #Superconducting Materials and Applications #cond-mat.other #cond-mat.stat-mech
paper · pdf · doi:10.48550/arxiv.1206.1429
9 pages, 2 figures
arxiv created 2012/06/07 · openalex publication_date 2012/06/07 · arxiv updated 2012/06/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We proceed from the premise that the spectrum of elementary excitations in the normal component in Landau's theory of superfluidity should depend on the superfluid helium temperature. This leads to generalization of the Landau superfluidity criterion. On this basis, taking into account available experimental data on inelastic neutron scattering, it is shown that, in addition to phonon--roton excitations, there is one more type of elementary excitations in superfluid helium, which we called helons. The energy spectrum with such a momentum dependence was first proposed by Landau. The helon energy spectrum shape and its temperature dependence make it possible to explain the singular behavior of the heat capacity of superfluid helium near its phase transition to the normal state.