Planar Aerogel and Superfluid $^3$He, Structure and Transitions
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913247414714368 |
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| author | Scott, J. W. Nguyen, M. D. Park, D. Halperin, W. P. |
| author_facet | Scott, J. W. Nguyen, M. D. Park, D. Halperin, W. P. |
| contents | Anisotropic aerogel possesses structure which exhibits a strong influence over the composition and orientation of the order parameter of imbibed superfluid $^3$He. Computational studies have identified stretched aerogel with plane-like structures and compressed aerogel with nematic-like structures. Studies of the B phase of superfluid $^3$He in stretched aerogel display an enhanced nuclear magnetic susceptibility likely caused by Andreev bound states near plane-like impurity sites. We report further details on the influence of these planar structures on both magnetic and orbital orientation transitions. The orbital orientation transitions appear in both the B and A phases of stretched and compressed aerogels. These transitions result from a crossover of the superfluid coherence length with long and short length scale structure with the coherence length and are consequently magnetic field independent. Additionally, the apparent temperature-independence of the susceptibility of the B phase equal to that of the A phase in stretched aerogel, is in marked contrast with the field dependence of the superfluid A to B phase transition, indicating that it is a near-isentropic transition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_00909 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Planar Aerogel and Superfluid $^3$He, Structure and Transitions Scott, J. W. Nguyen, M. D. Park, D. Halperin, W. P. Superconductivity Anisotropic aerogel possesses structure which exhibits a strong influence over the composition and orientation of the order parameter of imbibed superfluid $^3$He. Computational studies have identified stretched aerogel with plane-like structures and compressed aerogel with nematic-like structures. Studies of the B phase of superfluid $^3$He in stretched aerogel display an enhanced nuclear magnetic susceptibility likely caused by Andreev bound states near plane-like impurity sites. We report further details on the influence of these planar structures on both magnetic and orbital orientation transitions. The orbital orientation transitions appear in both the B and A phases of stretched and compressed aerogels. These transitions result from a crossover of the superfluid coherence length with long and short length scale structure with the coherence length and are consequently magnetic field independent. Additionally, the apparent temperature-independence of the susceptibility of the B phase equal to that of the A phase in stretched aerogel, is in marked contrast with the field dependence of the superfluid A to B phase transition, indicating that it is a near-isentropic transition. |
| title | Planar Aerogel and Superfluid $^3$He, Structure and Transitions |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2311.00909 |