Square-law Josephson detection of far-infrared radiation with current-biased granular Tl2Ba2CaCu2O8thin films

Huber, W.; Arendt, B; Huggard, P. G.; Prettl, Wilhelm

doi:10.1088/0953-2048/8/10/005

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…Possible mechanisms for this phenomenon are: 1) current flows around the precipitates at low currents in the normal state due to potential barriers at the boundaries, while at higher currents the higher parallel voltages push current through these barriers lowering the effective resistance and 2) a possible tunneling mechanism at weak links mainly created during the patterning process, where some undesired etching around the large particle precipitates is observed. This may also have an effect on the responsivity of the bolometer made of such films [28], [29]. That a further increase of current ( A) in Fig.…”

Section: A Microstructure Effects On the DC Characteristicsmentioning

confidence: 97%

DC characteristics of patterned YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconducting thin-film bolometers: artifacts related to Joule heating, ambient pressure, and microstructure

Fardmanesh

Scoles

Rothwarf

1998

IEEE Trans. Appl. Supercond.

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Cataloged from PDF version of article.Joule heating due to the bias current and resistance of the material in patterned YBa2Cu3O7-x superconducting films on 250-500-mu m-thick MgO, LaAlO3, and SrTiO3 crystalline substrates, results in a number of effects: 1) a temperature rise in the film with respect to the measured temperature at the bottom of the substrate; 2) a possible thermal runaway, which may be local or uniformly distributed in the film, depending upon the dimensions of the superconducting pattern relative to that of the substrate; 3) an apparently sharper normal-to-superconducting transition in the measure R versus T curve; and 4) decrease of T-c to 60 K (Delta T-x > 20 K) after being subjected to high-bias currents j similar to 10(5) A/cm(2) under vacuum, with recovery of T-c after exposure to room atmosphere. The magnitude of R at Tc-onset is found to be dependent on bias current in granular samples, with a lower R at currents higher than some on-set value. The slope of R versus T in the transition region in our granular samples is found to be lower at higher bias currents, since the widening of the transition overcomes the shift caused by the Joule heating. These various phenomena impact the responsivity of bolometers made from these films, as well as the predictions of possible attainable responsivity and speculations of mechanisms occurring in the films. In particular, misinterpretation of the Joule heating sharpening of the R versus T curve has led to predictions of responsivities over one order of magnitude higher than are justified, and shifts in properties of the films due to heating have been misinterpreted as nonequilibrium responses of the films

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Section: A Microstructure Effects On the DC Characteristicsmentioning

confidence: 97%

DC characteristics of patterned YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconducting thin-film bolometers: artifacts related to Joule heating, ambient pressure, and microstructure

Fardmanesh

Scoles

Rothwarf

1998

IEEE Trans. Appl. Supercond.

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“…[1][2][3][4][5] These films are believed to consist of stochiometric crystallites, each of which is coupled to its neighbours by weak links. The films are thus comprised of a random array of Josephson junctions, the critical currents of which are depressed by below gap radiation.…”

mentioning

confidence: 99%

Far infrared video detection and difference frequency mixing with tilted c-axis epitaxial YBa2Cu3O7−δ thin films

Huber

Berr

Kalbeck

et al. 1996

Applied Physics Letters

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Epitaxial YBa2Cu3O7−δ thin films, grown with a controllable misalignment between c-axis and surface normal, exhibit a sensitive photoresponse to far infrared laser radiation at temperatures below Tc. While no photoresponse was observed in c-axis normal films, a sensitivity of 0.2 V/W was measured at a wavelength of 432 μm for a film with a 20° c-axis tilt. Difference frequency mixing of two laser modes has also been demonstrated at intermediate frequencies between 200 kHz and 6 MHz. Both mixing and video detection are believed to originate in the ac Josephson effect: the effect of the tilted growth is to allow a component of the radiation field to be applied along the c-axis, thus modulating the relatively weak Josephson coupling in this direction.

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Fernziele der Nanoelektronik

Russer¹,

Lugli²,

Hess³

et al. 2013

Nanoelektronik

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Square-law Josephson detection of far-infrared radiation with current-biased granular Tl₂Ba₂CaCu₂O₈thin films

Cited by 6 publications

References 25 publications

DC characteristics of patterned YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconducting thin-film bolometers: artifacts related to Joule heating, ambient pressure, and microstructure

DC characteristics of patterned YBa/sub 2/Cu/sub 3/O/sub 7-x/ superconducting thin-film bolometers: artifacts related to Joule heating, ambient pressure, and microstructure

Far infrared video detection and difference frequency mixing with tilted c-axis epitaxial YBa2Cu3O7−δ thin films

Fernziele der Nanoelektronik

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