Search for an ac Josephson effect in superfluid He4 using a low-frequency acoustic resonator
B. P. Beecken, W. Zimmermann, Jr.
DOI 10.1103/PhysRevB.35.74 · Physical Review B
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Abstract
A search for a Josephson effect in superfluid He4 has been carried out with use of a low-frequency acoustic resonator in analogy to an rf-biased superconducting quantum interference device. Orifices from 100 to 400 nm in diameter in free-standing foils ∼100 nm thick were used as weak links. Observations were made at temperatures from 0.4 to 1.1 K and at pressures from 13 to 40 kPa. Aside from the suggestive behavior seen in one early run, no sign of a Josephson effect has been observed. Values of the order-parameter phase difference through the weak link at the critical rate of flow ranged from 9×2π to 33×2π rad at T=0.95 K.
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