BCS-like gap structure of HgBa{sub 2}CuO{sub 4+{delta}} tunnel junctions

Technical Report · Wed Nov 30 23:00:00 EST 1994

DOI:https://doi.org/10.2172/10104581· OSTI ID:10104581

Chen, J ^[1]; Zasadzinski, J F; Gray, K E; Wagner, J L; Hinks, D G ^[1]; Kouznetsov, K; Coffey, L ^[2]

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1. Argonne National Lab., IL (United States)
2. Illinois Inst. of Tech., Chicago, IL (United States)

The authors report point-contact tunneling into polycrystalline HgBa{sub 2}CuO{sub 4+{delta}} superconductors with a T{sub c} onset of 97 K using a superconducting Nb counterelectrode. These SIS tunnel junctions are of unusually high quality for cuprate superconductors, exhibiting low and flat sub-gap conductances and sharp conductance peaks as expected from a BCS density of states. These features are obtained reproducibly and are consistent with earlier published SIN results using an Au counterelectrode. Use of experimental data to simulate the performance of a quasiparticle mixer indicates that HgBa{sub 2}CuO{sub 4+{delta}} may be suitable for use in low noise heterodyne receivers operating at a few THz.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10104581
• Report Number(s): ANL/MSD/CP--83118; CONF-941013--16; ON: DE95004125; CNN: NSF Contract DMR-91-20000
• Country of Publication: United States
• Language: English

Related Subjects

665412
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BAND THEORY
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ENERGY GAP
EXPERIMENTAL DATA
GOLD
HETERODYNE RECEIVERS
HIGH-TC SUPERCONDUCTORS
MERCURY OXIDES
NIOBIUM
PERFORMANCE
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS
TRANSITION TEMPERATURE
TUNNEL EFFECT