Staircase pattern in a superfluid He-II torsional-oscillator analog of the radio-frequency SQUID

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.1528· OSTI ID:5425569

Bonaldi, M ^[1]; Cerdonio, M; Dolesi, R; Vitale, S ^[2]

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1. Centro di Fisica degli Stati Aggregati del Consiglio Nazionale delle Ricerche-Istituto Trentino di Cultura, I-38050 Povo, Trento (Italy)
2. Dipartimento di Fisica, Universita degli Studi di Trento, I-38050 Povo, Trento (Italy) Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento, Sezione di Padova, I-38050, Povo, Trento (Italy)

We are developing a superfluid [sup 4]He analog of the rf SQUID. A thin partition with a micrometric orifice is placed inside a toroidal container filled with liquid helium; ac and dc superflows through the orifice are induced by rotating the whole torus, which is the inertial member of a torsional oscillator. The torus oscillation amplitude vs drive curve shows a small but reproducible staircase pattern, which is detectable between 1.4 and 2.05 K, but is not modulated by a superimposed steady rotation. We discuss this behavior in terms of the occurrence of multiple phase slips.

• OSTI ID: 5425569
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:2; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665420* -- Superfluidity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRONIC EQUIPMENT
EQUIPMENT
EVEN-EVEN NUCLEI
FLUXMETERS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NUCLEI
OPENINGS
ORIFICES
OSCILLATORS
SQUID DEVICES
STABLE ISOTOPES
SUPERCONDUCTING DEVICES
SUPERFLUIDITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TORSION