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Miniature low-temperature high-frequency filters for single electronics (1995)

Courtois, H. ; Buisson, O. ; Chaussy, J. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 66 (1995), S. 3465-3468

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: Single-electron devices are now very promising for high-accuracy and high-sensitivity electrical measurements, based on the quantification of the macroscopic charge in metallic nanostructures. The ultimate performance of these devices can only be attained by a careful filtering of the measurement circuit at very low temperature (20 mK). A new kind of wide-band high-frequency filter integrated on a copper block has been designed and studied. This original substrate provides a massive and well-thermalized electric ground plane in the vicinity of the filter. Attenuation measurements show that one has to carefully design the filter box in order to avoid the transmission of electromagnetic modes through the filter box. An improved filter showed −95 dB attenuation at 20 GHz, without any increase of the transmission at high frequency. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1146442

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Nucleation of superconductivity in a thin film with a lattice of circular holes (1995)

Bezryadin, A. ; Pannetier, B.

Springer

Journal of low temperature physics 98 (1995), S. 251-268

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ISSN: 1573-7357

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We investigate experimentally the nucleation of superconductivity in a thin Aluminium film with a square lattice of microholes in a uniform perpendicular magnetic field H. It is shown that in a non-zero magnetic field, this system has an elevated critical temperature T c * (H) in comparison to the reference film without holes. This effect can be considered as a generalisation of the well known surface superconductivity effect for the case of a finite radius of the surface and a multiply connected geometry of the sample. Quantization of the fluxoid around each hole leads to oscillations in the T c * (H) dependence with a period approximately corresponding to one flux quantum through a hole. Also another type of oscillation with a smaller period which is equal to one flux quantum per unit cell was observed. We discuss the second type of oscillation in terms of an interaction between the holes. We believe that our results can be useful in the analysis of high-Tc superconductors with columnar defects because, as it is shown here, a comparison of the Tc(H) dependence before and after irradiation can give some special information on the properties of the amorphous tracks produced by highenergy ions. While many experimental parameters are different in our system and in HTSC we present arguments why this analogy should be correct.