INVESTIGADORES
SIRENA Martin
artículos
Título:
Highly reproducible High Tc Josephson
Autor/es:
J. LESUEUR; N. BERGEAL; M. SIRENA; X. GRISON; G. FAINI; M. APRILI; J. P. CONTOUR
Revista:
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Referencias:
Año: 2007 p. 963 - 966
ISSN:
1051-8223
Resumen:
Abstract Reproducible High Tc Josephson junctions have been
made in a rather simple two-step process using ion irradiation. A
microbridge 1 to 5 ìm wide is firstly designed by ion irradiating
a c-axis-oriented YBa2Cu3O7 film through a gold mask such as
the unprotected part becomes insulating. A lower Tc part is then
defined within the bridge by irradiating with a much lower dose
through a 20 wide narrow slit opened in a standard electronic
photoresist. These planar junctions, whose settings can be finely
tuned, exhibit reproducible and nearly ideal Josephson
characteristics. Non hysteretic RSJ like behavior is observed,
together with sinc Fraunhofer patterns for rectangular junctions.
The IcRn product varies with temperature ; it can reach a few
mV. The typical resistance ranges from 0.1 to a few ohms, and
the critical current density can be as high as 30 kA/cm2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.2Cu3O7 film through a gold mask such as
the unprotected part becomes insulating. A lower Tc part is then
defined within the bridge by irradiating with a much lower dose
through a 20 wide narrow slit opened in a standard electronic
photoresist. These planar junctions, whose settings can be finely
tuned, exhibit reproducible and nearly ideal Josephson
characteristics. Non hysteretic RSJ like behavior is observed,
together with sinc Fraunhofer patterns for rectangular junctions.
The IcRn product varies with temperature ; it can reach a few
mV. The typical resistance ranges from 0.1 to a few ohms, and
the critical current density can be as high as 30 kA/cm2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.ìm wide is firstly designed by ion irradiating
a c-axis-oriented YBa2Cu3O7 film through a gold mask such as
the unprotected part becomes insulating. A lower Tc part is then
defined within the bridge by irradiating with a much lower dose
through a 20 wide narrow slit opened in a standard electronic
photoresist. These planar junctions, whose settings can be finely
tuned, exhibit reproducible and nearly ideal Josephson
characteristics. Non hysteretic RSJ like behavior is observed,
together with sinc Fraunhofer patterns for rectangular junctions.
The IcRn product varies with temperature ; it can reach a few
mV. The typical resistance ranges from 0.1 to a few ohms, and
the critical current density can be as high as 30 kA/cm2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.2Cu3O7 film through a gold mask such as
the unprotected part becomes insulating. A lower Tc part is then
defined within the bridge by irradiating with a much lower dose
through a 20 wide narrow slit opened in a standard electronic
photoresist. These planar junctions, whose settings can be finely
tuned, exhibit reproducible and nearly ideal Josephson
characteristics. Non hysteretic RSJ like behavior is observed,
together with sinc Fraunhofer patterns for rectangular junctions.
The IcRn product varies with temperature ; it can reach a few
mV. The typical resistance ranges from 0.1 to a few ohms, and
the critical current density can be as high as 30 kA/cm2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.2. The
dispersion in characteristics is very low, in the 5% to 10% range.
Such nanojunctions have been used to make microSQUIDs
operating at LN2 temperature. They exhibit a very small
asymmetry, a good sensitivity and a rather low noise.
The process is easily scalable to make rather complex
Josephson circuits.