Effect of Magnetic Impurities on Superfluid 3He

被引：9

作者：

Zimmerman, A. M. ^{[1
]}

Nguyen, M. D. ^{[1
]}

Scott, J. W. ^{[1
]}

Halperin, W. P. ^{[1
]}

机构：

[1] Northwestern Univ, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 02期

基金：

美国国家科学基金会;

关键词：

PHASE-DIAGRAM; SUPERCONDUCTIVITY; SCATTERING; STATE; TEMPERATURE; SHIFT;

D O I：

10.1103/PhysRevLett.124.025302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is known that both magnetic and nonmagnetic impurities suppress unconventional superconductivity. Here we compare their effect on the paradigm unconventional superconductor, superfluid He-3, using highly dilute silica aerogel. Switching magnetic to nonmagnetic scattering in the same physical system is achieved by coating the aerogel surface with He-4. We find a marginal influence on the transition temperature itself. However, we have discovered that the A phase, which breaks time reversal symmetry, is strongly influenced, while the isotropic B phase is unchanged. Importantly, this occurs only if the impurities are anisotropically distributed on a global scale.

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页数：6

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