Measurement of the polar-phase gap in 3He in nafen shows the predicted T^3 temperature law, providing the first experimental evidence for a Dirac nodal line and supporting a generalized Anderson theorem.
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Topological nodal line in superfluid $^3$He and the Anderson theorem
Measurement of the polar-phase gap in 3He in nafen shows the predicted T^3 temperature law, providing the first experimental evidence for a Dirac nodal line and supporting a generalized Anderson theorem.