Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-07-10
1992-06-09
Hille, Rolf
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
357 19, 505 1, 505702, H01L 3922, H01L 3112, H01B 1200
Patent
active
051211734
ABSTRACT:
A VLWIR proximity effect detector 10 includes a substrate 12, a bulk superconducting material 14, a proximity layer 16 which overlies a portion of the bulk superconducting material 14, an insulator layer 17 and a transparent tunnelling electrode 18. Detector electrical contacts 19 are provided on the proximity layer 16 and on the electrode 18. VLWIR, indicated by the arrows, is absorbed in proximity layer 16 and causes a detectable modulation of tunnelling characteristics (current or voltage) between the proximity layer 16 and the electrode 18. The proximity layer has a thickness on the order of a coherence length for the material which comprises the proximity layer. In accordance with the invention it has been determined that a spatially varying energy gap (E.sub.gap) induced in the proximity layer by the adjacent superconducting material results in the proximity layer having a longer cut off wavelength than that of the adjacent bulk superconducting material. The lower value of the induced E.sub.gap within the proximity layer results in Cooper pair breaking with photons of lower energy, or longer wavelength, than is possible in the bulk superconducting material.
REFERENCES:
"n-InAs/GaAs Heterostructure Superconducting Weak Links with Nb Electrodes", Kleinsasser et al., Appl. Phys. Lett., vol. 49, #25, Dec. 22, 1986, pp. 1741-1743.
"New 120K Tl-Ca-Ba-Cu-O Superconductor", Sheng et al., Appl. Phys. Lett., vol. 52, #20, May 16, 1988, pp. 1738-1740.
"Bi-Sr-Ca-Cu-O Superconductor System with Critical Temperatures of 80 and 107K", Kugimiya et al., Appl. Phys. Lett., vol. 52, #22, May 30, 1988, pp. 1895-1896.
"Interdiffusion and Interfacial Reaction Between an YBa.sub.2 Cu.sub.3 O.sub.x Thin Film and Substrates", Nakijima et al., Appl. Phys. Lett., vol. 53, #15, Oct. 10, 1988, pp. 1437-1439.
"High-Temperature Superconductivity in Y-Ba-Cu-O: Identification of a Copper-Rich Superconducting Phase", Stacy et al., J. Am. Chem. Soc., vol. 109, 1987, pp. 2528-2530.
Denson-Low W. K.
Hille Rolf
Saadat Mahshid
Santa Barbara Research Center
Schubert W. C.
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