APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue

29 Dec 1997

Volume 71, Issue 26, pp. 3749-3909

Page 3 of 3 Pages Previous Page | Jump to Page

Microwave intermodulation in thin film high-Tc superconducting microstrip hairpin resonators: Experiment and theory

Balam A. Willemsen, T. Dahm, and D. J. Scalapino

Appl. Phys. Lett. 71, 3898 (1997); http://dx.doi.org/10.1063/1.120537 (3 pages) | Cited 29 times

Full Text: | Download PDF

Show Abstract
We present experimental results for microwave intermodulation in a series of superconducting hairpin resonators. We find that geometry plays a dominant role in determining both the losses and intermodulation in these resonators. The experimental data can be reproduced using recent theoretical calculations with a single parameter, JIMD (77 K). We compare the response of the fundamental and the first harmonic modes of these resonators to find that the use of the first harmonic mode gives less intermodulation, but we also find higher losses due to the more extended fields of this mode. © 1997 American Institute of Physics.
Show PACS
84.40.Az Waveguides, transmission lines, striplines
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
85.25.-j Superconducting devices

Experimental quasiparticle dynamics in a superconducting, imaging x-ray spectrometer

S. Friedrich, K. Segall, M. C. Gaidis, C. M. Wilson, D. E. Prober, A. E. Szymkowiak, and S. H. Moseley

Appl. Phys. Lett. 71, 3901 (1997); http://dx.doi.org/10.1063/1.120538 (3 pages) | Cited 25 times

Full Text: | Download PDF

Show Abstract
We present an experimental study of the time scales for various quasiparticle processes in a superconducting single photon spectrometer. Processes studied include quasiparticle recombination, diffusion, trapping, tunneling, and energy redistribution. Experiments were performed with a double junction, imaging x-ray detector whose charge output provides a measure of the photon energy. Time scales are extracted with a simple model and the values of several parameters, including the diffusion constant and recombination time, are found to differ from theoretical predictions. These results provide guidelines for performance analysis, device scaling, and future designs. © 1997 American Institute of Physics.
Show PACS
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
07.85.Nc X-ray and γ-ray spectrometers
29.30.Kv X- and γ-ray spectroscopy
85.25.Qc Superconducting surface acoustic wave devices and other superconducting devices
29.40.Wk Solid-state detectors

Third-order nonlinear microwave response of YBa2Cu3O7−δ thin films and single crystals

G. Hampel, B. Batlogg, K. Krishana, N. P. Ong, W. Prusseit, H. Kinder, and A. C. Anderson

Appl. Phys. Lett. 71, 3904 (1997); http://dx.doi.org/10.1063/1.120539 (3 pages) | Cited 21 times

Full Text: | Download PDF

Show Abstract
The nonlinear microwave response of superconducting YBa2Cu3O7−δ thin films and crystals was studied quantitatively by measuring the third-order harmonic amplitude E3ω (ω: 35 GHz, jRF ⩽ 3×104 A/cm2). We find E3ω to be dominated by two extrinsic effects: (1) the interaction with flux lines in weak links, leading to an increased nonlinear response at low temperatures, and (2) rf related flux line creation at film edges, yielding a high E3ω-signal close to Tc. Both effects together lead to a minimum in E3ω around 40–60 K, which makes this temperature interval interesting for rf applications. Intrinsic nonlinearities are smaller by orders of magnitude and could not be detected. © 1997 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.25.N- Response to electromagnetic fields

Extension of colossal magnetoresistance properties to small A site cations by chromium doping in Ln0.5Ca0.5MnO3 manganites

A. Barnabé, A. Maignan, M. Hervieu, F. Damay, C. Martin, and B. Raveau

Appl. Phys. Lett. 71, 3907 (1997); http://dx.doi.org/10.1063/1.120540 (3 pages) | Cited 95 times

Full Text: | Download PDF

Show Abstract
The Mn site substitutions of charge ordered (CO) manganites Ln0.5Ca0.5MnO3 (Ln=La–Tb) have been investigated. Among the different studied doping elements, chromium is shown to be the most efficient one to induce a metal insulator (MI) transition in the CO undoped insulators. A new Tm(〈rA〉) magnetic diagram, where 〈rA〉 is the A site cationic average radius, is established for the oxides Ln0.5Ca0.5Mn1−xCrxO3, which demonstrates that 〈rA〉 is not a rhedibitory parameter for the occurrence of colossal magnetoresistance (CMR) properties. The average size limit 〈rA〉L ≈ 1.19 Å below which the MI transition is suppressed in the undoped CO compounds is indeed lowered to 〈rA〉L ≈ 1.14 Å in the Cr-doped materials. The electron microscopy study of these Cr doped oxides shows that this spectacular effect corresponds with the disappearance of the structural transition associated with CO. © 1997 American Institute of Physics.
Show PACS
72.20.My Galvanomagnetic and other magnetotransport effects
71.30.+h Metal-insulator transitions and other electronic transitions
72.80.Sk Insulators
75.50.Ee Antiferromagnetics
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Dd Nonmetallic ferromagnetic materials
Page 3 of 3 Pages Previous Page | Jump to Page
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close