On the Novel Superfluidity in the Second Layer of $^4$He on Graphite
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arXiv
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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866908755011043328 |
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| author | Usami, Jun Fukuyama, Hiroshi |
| author_facet | Usami, Jun Fukuyama, Hiroshi |
| contents | Evidence for a new type of superfluid phase in second-layer $^4$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 studies. The new phase hosts both superfluidity and enhanced viscoelasticity, and is stable over a finite density interval, strongly supporting the proposed superfluid liquid-crystal hypothesis. A random-Josephson-network analysis shows that the widely reported log-$T$ dependence of the superfluid density is likely due to substrate imperfections. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_05719 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | On the Novel Superfluidity in the Second Layer of $^4$He on Graphite Usami, Jun Fukuyama, Hiroshi Other Condensed Matter Evidence for a new type of superfluid phase in second-layer $^4$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 studies. The new phase hosts both superfluidity and enhanced viscoelasticity, and is stable over a finite density interval, strongly supporting the proposed superfluid liquid-crystal hypothesis. A random-Josephson-network analysis shows that the widely reported log-$T$ dependence of the superfluid density is likely due to substrate imperfections. |
| title | On the Novel Superfluidity in the Second Layer of $^4$He on Graphite |
| topic | Other Condensed Matter |
| url | https://arxiv.org/abs/2601.05719 |