3 papers
cond-mat.other2026
Commensurate-Incommensurate Transition in Submonolayer He on Graphite
A. Kumashita, J. Usami, S. Komatsu +4
We report high-precision heat-capacity measurements of submonolayer He adsorbed on highly crystalline graphite, revealing new aspects of the commensurateincommensurate trans…
cond-mat.other2026
On the Novel Superfluidity in the Second Layer of He on Graphite
Jun Usami, Hiroshi Fukuyama
Evidence for a new type of superfluid phase in second-layer He on graphite has been obtained from simultaneous measurements of torsional-oscillator response and heat-capacity o…
cond-mat.mtrl-sci2025
Growth of uniform helium submonolayers adsorbed on single-surface graphite observed by surface X-ray diffraction
Atsuki Kumashita, Hiroo Tajiri, Jun Usami +4
We observed surface X-ray diffraction from He-4 submonolayers adsorbed on a single-surface graphite using synchrotron X-rays. Time evolutions of scattering intensities along the cr…