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Low Frequency Noise In Freely Suspended Tin Films At The Superconducting Transition Spectral Density
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Book Synopsis Low Frequency Noise in Freely Suspended Tin Films at the Superconducting Transition. [Spectral Density]. by :
Download or read book Low Frequency Noise in Freely Suspended Tin Films at the Superconducting Transition. [Spectral Density]. written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The spectral density, S/sub v/(f), of the voltage noise across 1-D current-biased tin films has been measured at the superconducting transition. Each film was freely suspended between two thermal clamps a distance L apart in a vacuum can. A thin layer of lead was evaporated on the outer portion of the films to leave an uncoated middle region of length l. S/sub v/(f) was flat at frequencies below f/sub L/ approximately D/L2, where D is the thermal diffusivity. At frequencies between f/sub L/ and f/sub l/ approximately (L/l)2f/sub L/ the slope was typically -0.8, while at frequencies above f/sub l/ the slope was somewhat less steep than -1.5. The shape and magnitude of S/sub v/(f) were in good agreement with an equilibrium temperature fluctuation model in which the temperature fluctuations are spatially uncorrelated. Measurements of the autocorrelation function also strongly supported this model. These results are in contrast with those obtained for normal films and films at the superconducting transition supported by substrates, for which a model was required with spatially correlated fluctuations. It is concluded that the 1/f noise for films on substrates is mediated by an interaction between the substrate and the film.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 1780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis I. Low Frequency Noise in Metal Films at the Superconducting Transition by : Thomas Yih Hsiang
Download or read book I. Low Frequency Noise in Metal Films at the Superconducting Transition written by Thomas Yih Hsiang and published by . This book was released on 1977 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis I. Low Frequency Noise in Metal Films at the Superconducting Transition. II. Resistance of Superconductor - Normal Metal- Superconductor Sandwiches and the Quasiparticle Relaxation Time by :
Download or read book I. Low Frequency Noise in Metal Films at the Superconducting Transition. II. Resistance of Superconductor - Normal Metal- Superconductor Sandwiches and the Quasiparticle Relaxation Time written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the noise power spectra of tin and lead films at the superconducting transition in the frequency range of 0.1 Hz to 5k Hz are reported. Two types of samples were made. Type A were evaporated directly onto glass substrate, while Type B were evaporated onto glass or sapphire substrate with a 50A aluminum underlay. The results were consistent with a thermal diffusion model which attributes the noise to the intrinsic temperature fluctuation in the metal film driven with a random energy flux source. In both types of metal films, the noise power was found to be proportional to (V-bar)2 .beta.2/.cap omega., where V-bar was the mean voltage across the sample, .beta. was the temperature coefficient of resistance and .cap omega. was the volume of the sample. Correlation of noises in two regions of the metal film a distance d apart was detected at frequencies less than or = D/.pi.d2. A possible explanation of the noises using quantitative boundary conditions and implications of this work for device applications are discussed. Theoretical and experimental investigation are reported on the resistance of superconductor-normal metal-superconductor sandwiches near T/sub c/. The increase in SNS resistance is attributed to the penetration of normal electric current in the superconductor. It is proved from first principles that an electric field can exist inside the superconductor when quasiparticles are not equally populated on the two branches of the excitation spectrum, and such is the case in a current biased SNS junction. The electric field inside S decays according to a diffusion law. The diffusion length is determined by the quasiparticle ''branch-crossing'' relaxation time. The branch-crossing relaxation times were measured. Impurity-doping of tin was found to decrease this relaxation time.
Download or read book Physics, Uspekhi written by and published by . This book was released on 1997 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Superconducting Transition Edge Bolometer and Noise in Thin Films by : Nan-Hsiung Yeh
Download or read book Superconducting Transition Edge Bolometer and Noise in Thin Films written by Nan-Hsiung Yeh and published by . This book was released on 1978 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindex written by and published by . This book was released on 1978 with total page 1436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-frequency Noise in High-t Superconductor Josephson Junctions, SQUIDs, and Magnetometers by : Andrew Hostetler Miklich
Download or read book Low-frequency Noise in High-t Superconductor Josephson Junctions, SQUIDs, and Magnetometers written by Andrew Hostetler Miklich and published by . This book was released on 1994 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Frequency Noise in Superconducting Sn Films at the Transition Temperature by :
Download or read book Low Frequency Noise in Superconducting Sn Films at the Transition Temperature written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1978 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Excess Noise in the Superconducting Transition of Tin Films by : Hengsong Zhang
Download or read book Excess Noise in the Superconducting Transition of Tin Films written by Hengsong Zhang and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The I-V characteristics of Tin films in the superconducting transition have been measured when ac current was applied. The experimental results suggest that the electrical response in ac is not satisfied with the I-V equation in dc. A new equation was suggested to describe the vortex motion and the vortex pair separation in the two dimensional superconducting transition with ac current, which is satisfied with our experimental results. The excess noises of Tin films in the superconducting transition have been found to depend strongly on the temperature and ac current. An empirical expression of voltage noise density in term of resistance has been used to fit the data. The peak of voltage noise density follows closely but always shifted down from dR/dT. Comparison with the dc noise measurement shows the voltage noise density with ac current is much larger than with dc current. The excess noises with ac appear earlier than the noises with dc. The difference of excess noises between ac and dc can be explained by the fluctuation of vortex pair separation process which dominates the noises generation in ac. I-V characteristics and voltage noises are measured simultaneously to reveal the nature of the excess noises. The coincidence of the excess noise and the third harmonic voltage suggests that the fluctuation of vortex pair separation process is one of the main contributions to excess noises in the two dimensional superconducting transition.
Book Synopsis Growth and Low Frequency Noise Properties of Grey Tin Films by : Hye-Rim Kim
Download or read book Growth and Low Frequency Noise Properties of Grey Tin Films written by Hye-Rim Kim and published by . This book was released on 1991 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Book Synopsis Frequency Standards by : Fritz Riehle
Download or read book Frequency Standards written by Fritz Riehle and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of all measurement units, frequency is the one that may be determined with the highest degree of accuracy. It equally allows precise measurements of other physical and technical quantities, whenever they can be measured in terms of frequency. This volume covers the central methods and techniques relevant for frequency standards developed in physics, electronics, quantum electronics, and statistics. After a review of the basic principles, the book looks at the realisation of commonly used components. It then continues with the description and characterisation of important frequency standards from atomic clocks, to frequency stabilised lasers. The whole is rounded of with a discussion of topical applications in engineering, telecommunications, and metrology.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1992 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1998 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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