Response of superconducting Y–Ba–Cu–O films to millimeter wave radiation
The origin of temperature and radiation power response dependencies to millimeter wave radiation is analyzed for Y–Ba–Cu–O thin films. These dependencies were both experimentally measur...
The origin of temperature and radiation power response dependencies to millimeter wave radiation is analyzed for Y–Ba–Cu–O thin films. These dependencies were both experimentally measur...
Ballistic magnetoresistance in a magnetic nanometer sized contact: An effective gate for spintronics
We present experimental results of unprecedented large magnetoresistance obtained in stable electrodeposited Ni–Ni nanocontacts 10–30 nm in diameter. The contacts exhibit magnetoresistance o...
We present experimental results of unprecedented large magnetoresistance obtained in stable electrodeposited Ni–Ni nanocontacts 10–30 nm in diameter. The contacts exhibit magnetoresistance o...
Sputtered nanodots: A costless method for inducing effective pinning centers in superconducting thin films
Appl. Phys. Lett. 79, 4547 (2001); doi:10.1063/1.1428632
Issue Date: 31 December 2001
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A straightforward and cheap method for creating extended defects, strong pinning centers, in superconducting thin films is proposed. Clearly, by very short time (3–5 s) rf sputtering at suitable substrate temperatures, we deposited Ag nanodots on SrTiO3 substrates prior to the growth of superconducting thin films. The nanodots were studied by atomic force microscopy. Due to the lattice mismatch and/or chemical poisoning, on top of the nanodots the superconducting phase does not form, creating in this way extended and effective pinning centers which increase the critical current density of the film. The method was applied to (Cu, Tl)BaSrCa2Cu3Oy films grown by amorphous phase epitaxy. Thin films grown in similar conditions, with and without nanodots, were characterized by x-ray diffraction and ac susceptibility. The results show that the nanodots increased the critical current density more than one order of magnitude. ©2001 American Institute of Physics.
| History: | Received 22 August 2001; accepted 30 October 2001 |
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http://link.aip.org/link/?APPLAB/79/4547/1 |
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BibSonomy
KEYWORDS and PACS
copper compounds,
thallium compounds,
barium compounds,
strontium compounds,
calcium compounds,
superconducting epitaxial layers,
high-temperature superconductors,
flux pinning,
critical current density (superconductivity),
X-ray diffraction,
magnetic susceptibility,
silver,
quantum dots,
sputter deposition,
atomic force microscopy
- 74.76.Bz
Superconductivity Superconducting films High-Tc films - 74.60.Ge
Superconductivity Type-II superconductivity Flux pinning, flux creep, and flux-line lattice dynamics - 74.72.Fq
Superconductivity High-Tc compounds Tl-based cuprates - 68.65.Hb
Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties Quantum dots - 68.55.Ln
Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Thin film structure and morphology Defects and impurities: doping, implantation, distribution, concentration, etc. - 74.25.Ha
Superconductivity General properties; correlations between physical properties in normal and superconducting states Magnetic properties - 74.60.Jg
Superconductivity Type-II superconductivity Critical currents - 81.07.Ta
Materials science Nanoscale materials and structures: fabrication and characterization Quantum dots - 81.15.Cd
Materials science Methods of deposition of films and coatings; film growth and epitaxy Deposition by sputtering - YEAR: 2001
RELATED DATABASES
PUBLICATION DATA
0003-6951 (print)
1077-3118 (online)
AIP
REFERENCES (6)
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