Author(s): Jun Usami and Hiroshi Fukuyama Evidence for a new type of superfluid phase in second-layer $^{4}\mathrm{He}$ on graphite has been obtained from simultaneous measurements of torsional-oscillator response and heat capacity on exactly the same sample down to 30 mK, which resolve substrate-related uncertainties in the previous studie… [Phys. Rev. Lett. 137, 046001] Published Mon Jul 20, 2026