Orbital-flop transition of superfluid (3)He in anisotropic silica aerogel.
Orbital-flop transition of superfluid (3)He in anisotropic silica aerogel.
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DOI：
10.1038/s41467-023-44557-5
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发表时间：
2024-01-03
影响因子：
16.6
通讯作者：
Halperin, W. P.
中科院分区：
文献类型：
--
作者：
Nguyen, M. D.;Simon, Joshua;Scott, J. W.;Zimmerman, A. M.;Tsai, Y. C. Cincia;Halperin, W. P.
超流3He是奇宇称库珀配对的范例，范围从中子星到铀基超导化合物。最近，它已被证明，3He，吸收在各向异性的二氧化硅气凝胶与正或负应变，优先选择手性A相或时间反演对称的B相。这种对基本序参量对称性的控制为理解不完美的非常规超导体提供了一个有用的模型。对于这两个阶段，轨道量子化轴是固定的应变的方向。出乎意料的是，在特定的温度Tx下，轨道轴跳动90 ° C，但A相和B相的顺序相反。借助于扩散限制簇聚集模拟的各向异性气凝胶和小角度X射线测量，我们能够将这些气凝胶分类为“平面”和“平面”，得出结论，轨道翻转是由这些气凝胶中的短程和长程结构之间的竞争引起的。当吸收在各向异性的二氧化硅气凝胶中时，超流体3He经历温度驱动的“轨道翻转”转变，其中轨道量子化轴旋转90度。在这里，通过模拟平面和气凝胶，M。D. Nguyen等人表明，气凝胶的轨道翻转转变是由不同的大尺度和小尺度结构驱动的。
Superfluid 3He is a paradigm for odd-parity Cooper pairing, ranging from neutron stars to uranium-based superconducting compounds. Recently it has been shown that 3He, imbibed in anisotropic silica aerogel with either positive or negative strain, preferentially selects either the chiral A-phase or the time-reversal-symmetric B-phase. This control over basic order parameter symmetry provides a useful model for understanding imperfect unconventional superconductors. For both phases, the orbital quantization axis is fixed by the direction of strain. Unexpectedly, at a specific temperature Tx, the orbital axis flops by 90∘, but in reverse order for A and B-phases. Aided by diffusion limited cluster aggregation simulations of anisotropic aerogel and small angle X-ray measurements, we are able to classify these aerogels as either “planar" and “nematic" concluding that the orbital-flop is caused by competition between short and long range structures in these aerogels. When imbibed in an anisotropic silica aerogel, superfluid 3He undergoes a temperature-driven “orbital flop" transition, where the orbital quantization axis rotates by 90 degrees. Here, by simulating planar and nematic aerogel, M. D. Nguyen et al. show that the orbital flop transition is driven by the distinct large- and small-scale structures of the aerogel.
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