Subharmonic Shapiro steps in Josephson-junction arrays

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.921· OSTI ID:5492909

Lee, H C; Newrock, R S; Mast, D B ^[1]; Hebboul, S E; Garland, J C ^[2]; Lobb, C J ^[3]

---

1. Department of Physics, University of Cincinnati, Cincinnati, Ohio 45221 (USA)
2. Department of Physics, Ohio State University, Columbus, Ohio 43210 (USA)
3. Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (USA)

Subharmonic Shapiro step structure has been observed in the current-voltage characteristics of 300{times}300 Nb-Au-Nb superconducting arrays. This subharmonic structure does not appear in the current-voltage characteristics of individual junctions, but appears to reflect a unique dynamical mode of the coupled system. A qualitative model is proposed that attributes the structure to the dynamical response of quantized loops of flux that are created by the antisymmetric self-magnetic field of the array bias current. Application of an external asymmetric magnetic field modifies the structure, which lends strong support to our model.

• OSTI ID: 5492909
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:2; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
FLUX QUANTIZATION
GOLD
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL MODELS
METALS
NIOBIUM
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TRANSITION ELEMENTS