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Magnetic Susceptibility of Andreev Bound States in Superfluid ^{3}He-B
J W Scott1, M D Nguyen1, D Park1
1Northwestern University, Evanston, Illinois 60208, USA.
Abstract:
Nuclear magnetic resonance measurements of the magnetic susceptibility of superfluid ^{3}He imbibed in anisotropic aerogel reveal anomalous behavior at low temperatures. Although the frequency shift clearly identifies a low-temperature phase as the B phase, the magnetic susceptibility does not display the expected decrease associated with the formation of the opposite-spin Cooper pairs. This susceptibility anomaly appears to be the predicted high-field behavior corresponding to the Ising-like magnetic character of surface Andreev bound states within the planar aerogel structures.
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