noise in high temperature superconductor josephson junctions

... in High- Temperature Superconductors László Béla Kish Noise in High- Temperature Superconductor Josephson Junctions J.C Macfarlane, L Hao, and C.M Pegrum High- Temperature RF SQUIDS V I Shnyrkov High- Temperature ... techniques for high- Tc thin-film fabrication are described in Chapter Readers interested in knowing the advancements in high- Tc film fabrication will find it very interesting and informative Chapters ... Dekker, Inc All Rights Reserved iv Preface introduce basic terminology so that the readers in other fields interested in hightemperature superconductor electronics will find no difficulty in reading...

Ngày tải lên: 27/06/2014, 15:20

... been performed for mainly two purposes The first was to calculate the electron-phonon interaction and its influence on the increased transition temperature for high temperature superconductors Secondly, ... made in this paper to study phonon frequencies in Bi2Sr2Ca2Cu3O10 high temperature superconductor in the frame work of modified three body force shell model (TSM) The calculations for high temperature ... Spectra of High Temperature Superconductor 64 The phonon frequencies evaluated around 400 cm–1 includes infrared active phonons involving metal ion vibrations and CuO2 and Bi-O-Cu bending modes...

Ngày tải lên: 07/08/2014, 14:20

... in High- Temperature Superconductors László Béla Kish Noise in High- Temperature Superconductor Josephson Junctions J.C Macfarlane, L Hao, and C.M Pegrum High- Temperature RF SQUIDS V I Shnyrkov High- Temperature ... techniques for high- Tc thin-film fabrication are described in Chapter Readers interested in knowing the advancements in high- Tc film fabrication will find it very interesting and informative Chapters ... Dekker, Inc All Rights Reserved iv Preface introduce basic terminology so that the readers in other fields interested in hightemperature superconductor electronics will find no difficulty in reading...

Ngày tải lên: 10/08/2014, 19:20

... in more detail in the other chapters of this book The simplest method for preparing high- Tc superconductors is a solid-state thermochemical reaction involving mixing, calcination, and sintering ... superconducting state in high- Tc superconductors consisted of paired electrons or of something else One way to find out is by measuring a trapped flux in the high- Tc superconducting ring Gough ... to pellets and sintered The sintering environment such as temperature, annealing time, atmosphere, and cooling rate play a very important role in getting good high- Tc superconducting materials...

Ngày tải lên: 10/08/2014, 19:20

... SrTiO3, indicating the presence of additional flux pinning defects in the films These pinning sites may be associated with growth-induced defect structures, low-angle grain-boundary pinning, or ... Difficulties arise in the synthesis of these materials due in part to the high volatility of Hg-based compounds, requiring significant effort in maintaining the Hg content during film processing The toxic ... grown in situ using molecular oxygen typically have a maximum Tc of only 30 K, even after postannealing in atm oxygen High- oxygen-pressure annealing (153) has proven useful in increasing the Tc in...

Ngày tải lên: 10/08/2014, 19:20

... significantly increased by increasing the time of the chemical etching or in combination with ion beam etching (19) In addition, for using low ion-milling energy, annealing the sample in oxygen can ... during ion milling (17) Ion-milling damage to the ramp edge can be partially removed by Br–ethanol etching after the ion-milling process (18) It has shown that the interfaces produced involving ... used insulating materials to isolate the superconducting electrodes are PrBa2Cu3O7 (PBCO), LaAlO3, NdGaO3, SrTiO3, MgO, and CeO2 The insulating layer should be highly resistive at operating temperatures...

Ngày tải lên: 10/08/2014, 19:20

... Hamiltonian (64,65) Within the HTS family of Josephson junctions (JJs) the DLS has been observed also in Bi2Sr2CaCu2Oy mesas (66,67) consisting of intrinsic (naturally stacked) Josephson junctions The ... level independent of the cooling field The Lorentzian noise originates at least partly from a single longrange hopping of a trapped Abrikosov flux vortex between two pinning sites, and the 1/ƒ noise ... sides terminating by basal plane face In the following stages of the film growth, the triangular grain may be ¯ covered and embedded by larger nuclei expanding either in the [110] or in the ¯...

Ngày tải lên: 10/08/2014, 19:20

... Intrinsic high- Tc Josephson junctions in random-telegraph -noise fluctuators Phys Rev B 53:90–93, 1996 B Savo B, C Coccorese Vortex-induced voltage instabilities in a superconducting BSCCO thin ... Svedlindh, LKJ Vandamme, CM Muirhead, Z Ivanov, T Claeson Current controlled percolation exponents in the noise of high- temperature superconductor thin films In: ChR Doering, LB Kiss, MF Shlesinger, ... LB Kiss, P Svedlindh Noise in high- Tc superconductors, IEEE Trans Electr Dev 41:2112–2122, 1994 LB Kiss, P Svedlindh New noise exponents in conductor superconductor and conductor–insulator random...

Ngày tải lên: 10/08/2014, 19:20

... excess noise in RF SQUIDs Both phenomena can induce the Lorentzian flux noise spectrum [see Eq (57) for “telegraph” noise] in high- Tc materials, Josephson junctions, and RF SQUIDs We find that ... to ␩a,␽ and that is why the noise reduced to the SQUID input remains finite and defines the intrinsic nonhysteretic SQUID energy by a high- Tc RF loop and tank circuit noise Detailed researches ... uncertainty of the magnetic flux values corresponding to the instant of decay (jump) seems to be a reason for uncertainty of flux variations which gives to the intrinsic high- Tc SQUID loop noise In...

Ngày tải lên: 10/08/2014, 19:20

... 8.3 HIGH- TC JOSEPHSON JUNCTIONS AND SQUIDS In the low-Tc SQUID, S-I-S (superconductor insulator superconductor) tunnel junctions are usually used for the fabrication of the SQUID In high- Tc superconductors, ... studies (155) such as in imaging of half-flux quantum in a tricrystal superconducting ring of YBCO for determining the pairing symmetry (157), magnetic vortices in superconducting networks and clusters ... The thermal noise power in the SQUID is ᎏ1ᎏkBT/Hz and the mean en2 2 ergy per Hertz in an inductor is ᎏ1ᎏLSQ In ; thus In ϭ kBT/LSQ The corresponding equivalent flux noise is ⌽2 ϭ L2 In ϭ LSQ kBT...

Ngày tải lên: 10/08/2014, 19:20

... reduce cooling costs as well as increase the operating frequencies because of the higher Ic Rn products of HTS Josephson junctions, but a higher operating temperature results in more thermal noise ... much above 40 K Maintaining constant noise margins at elevated temperatures would require junction Ic values to increase in proportion to operating temperature and the circuit inductance values ... obtained at 30 K 9.3.2.2 Parasitic Inductance Parasitic inductance is unavoidable in practical layouts arranging Josephson junctions and contacts in SFQ digital circuits The line inductance in...

Ngày tải lên: 10/08/2014, 19:20

... annealing is performed for obtaining a superconducting thin film In the range of operating temperatures from 60 to 77 K that is practical for high- Tc microwave devices, high- quality YBCO and TBCCO ... These include 3D structure using dielectric resonators and 2D planar structure fabricated using high- Tc thin films The performance of some high- Tc superconductor filters is summarized in Table ... lines offer the highest bandwidth with much lower insertion loss in a highly compact design Several high- Tc planar transmission lines such as stripline, microstrip, and coplanar lines could be...

Ngày tải lên: 10/08/2014, 19:20

... below, at, or above Tc Infrared detection in the fully superconducting regime includes quantum detectors operating by pair-breaking, modifying an HTS property such as the kinetic inductance or critical ... consider three other noise sources: Johnson noise, 1/ƒ noise, and signal or photon noise The Johnson and 1/ƒ noise can originate both in the bolometer itself and in following stages of the electronics ... bias causes the Johnson noise to dominate unduly, whereas 1/ƒ noise eliminates the advantage of increasing the bias beyond a certain point The target itself can contribute noise, as the emission...

Ngày tải lên: 10/08/2014, 19:20

... them from being truly invisible to the user 12.2 COOLING WITH CRYOGENIC FLUIDS 12.2.1 Properties of Cryogenic Fluids In most cases, liquid nitrogen is used for cooling high- temperature superconductors ... at temperatures below the inversion temperature Some heating occurs for expansion at temperatures above the inversion temperature for that particular gas Typically, nitrogen or argon is used in ... diameter is 3.0 mm 12.5 STIRLING CRYOCOOLERS 12.5.1 Operating Principles The Stirling cycle was invented in 1815 by Robert Stirling for use as a prime mover Although used in the latter part of that...

Ngày tải lên: 10/08/2014, 19:20

... flux stored in a superconducting loop is used as an individual bit of information The quality of Josephson junctions included in the loop is the most important factor in constructing an integrated ... observing magnetic brain waves by using 256-channel LTS SQUIDs and also of observing magnetic heart waves by using 36-channel HTS SQUIDs was started The system for detecting human magnetic brain ... users join this system, the HTS microwave filters will be used in order to prevent interference The number of base stations in Japan is increasing and is expected to become 200 thousand in the...

Ngày tải lên: 10/08/2014, 19:20

... streaking in switchingbased median filters with minimal increase in computational load while preserving edges and removing most of the noise The new scheme employs linear prediction in combination ... and processing only noisy pixels is the main principle in switching-based median filters There are three stages in switching-based median filtering, namely, noise detection, estimation of noise- free ... pepper noise EURASIP Journal on Advances in Signal Processing Array labeled Y2 depicts the current processing window and a pepper noise pixel The square shown in solid line represents the window;...

Ngày tải lên: 21/06/2014, 16:20

... superimposed sinusoids uniformly frequency spaced and having the same magnitude: (a) detection rate against white noise, (b) detection rate against colored noise (a = 0.75), (c) detection rate against ... have been obtained on a PC Pentium IV, operating at 650 MHz CONCLUSION A new method is proposed in the paper for estimating the number of harmonic components in colored noise Its principle is based ... degree in electronic engineering, and in 1999 he received the Ph.D degree in signal processing, both from the University of Brest Between 1992 and 2002 he taught and developed research activities in...

Ngày tải lên: 23/06/2014, 01:20

... as shown in Figure 2.3, has been very effective in maintaining stable operating point and hence reliable circuit operation as proven in [23] It provides a bias point that is temperature independent ... more sensors could be incorporated into the tool string This has significant impact on the oil industry and has generated great interest in High Temperature IC’s for oil-well instrumentation 1.2 ... 1.3 HT Temperature Sensor The main focus of this research is temperature sensors operating at high temperatures above 200°C HT temperature sensor is a critical component in any oil-well instrumentation...

Ngày tải lên: 09/09/2015, 11:33

... system varied widely, and began to perform 100% margin and less network downtime incoming inspection to ensure the performance matched its high internal standards (which were admittedly tougher ... according to TIA guidelines ance, when they are specifying structured jack is now much better understood, and for patch cord tests (special fixtures and cabling requirements The cable plant is incompatibility ... the end (in is much higher than Category or 5e, espe- same patch cord is added to a marginal patch cords) versus somewhere in the cially for NEXT and Return Loss For opti- Permanent Link, the...

Ngày tải lên: 26/10/2013, 19:15

... socket mounting holes (that the socket clips into) General Consider doing several mitigation techniques together (e.g removing fasteners, unbundling and applying Random Lay, plus changing patch ... entire length Separating only at the beginning of the channel improves the ANEXT, but it does not improve AACR-F Replace the existing Category cabling with CopperTen cabling At the TO When the ... cables into bundles Do not fasten any cables onto the tray/mesh except for change of vertical direction >45° or to maintain a fixes separation from a hazardous service At the consolidation point,...

Ngày tải lên: 27/10/2013, 17:15