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Probe of high-temperature superconduting radio frequency quantum inteferometer

A technology of quantum interference and high temperature superconductivity, which is applied in the field of weak magnetic field measurement devices, and can solve the problems of reducing the sensitivity of magnetic field, reducing the effective area of ​​SQUID, and cannot be further improved.

Inactive Publication Date: 2004-01-28
PEKING UNIV
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Problems solved by technology

However, in this structure, the effective area of ​​the device is limited by the size of the superconducting thin film coplanar resonator, which cannot be further improved
Especially if people further increase the operating frequency in order to avoid the wireless communication (mobile phone) frequency band, for example, to 1.23 ~ 1.42GHz, at this time the size of the coplanar resonator needs to be reduced proportionally, resulting in a reduction in the effective area of ​​the SQUID , thus reducing the magnetic field sensitivity

Method used

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  • Probe of high-temperature superconduting radio frequency quantum inteferometer
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  • Probe of high-temperature superconduting radio frequency quantum inteferometer

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Embodiment Construction

[0029] As shown in Fig. 2(a), the probe is composed of three layers. The magnetic flux focusers (21 and 22) are made of larger YBCO superconducting thin films, and the SQUID devices (23 and 24) with an outer diameter of =3.5mm are attached to the magnetic flux focusers face to face. Superconducting thin film hollow coplanar resonators (26 and 27) are placed above the SQUID device, between the SQUID device and the microwave coupling ring 25. The distance between the superconducting thin film hollow coplanar resonator and the SQUID device can be adjusted by adding a certain thickness of LaAlO 3 shim 28 to change the coupling coefficient κ between the SQUID device and the resonator circuit.

[0030] As shown in Figure 2 (b) and (c), respectively, the superconducting thin film 26 constituting the hollow coplanar resonator and the superconducting thin film 22 constituting the magnetic flux focuser are fabricated on LaAlO 3 on substrates 27 and 21. The thin film was prepared by ...

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Abstract

The probe of the HTc rf SQUID comprises the hollow coplane resonator of superconducting film, the magnetic flux focuser of superconducting film, SQUID device and the microwave-coupling loop. The SQUID device is positioned above the magnetic flux focuser, and the hollow coplane resonator is positioned between the SQUID device and the microwave-coupling loop but above the SQUID device. Since the air core coplane resonator is separated from the magnetic flux focuser, thus, bigger focuser can be made so as to obtain larger effective area and raise sensitivity of magnetic field. Designing size ofthe hollow coplane resonator makes the probe operate at frequencies between 1.23-1.42 GHz, center frequency near 1.3 GHz so as to avoid interference of radio communication frequency range.

Description

Technical field: [0001] The invention belongs to the field of weak magnetic field measuring devices, in particular to a probe of a high temperature superconducting radio frequency quantum interferometer (HTcrf SQUID). Background technique: [0002] At present, the basic research of high temperature superconducting quantum interferometer (HTc SQUID), whether it is DC superconducting quantum interferometer (dcSQUID) or radio frequency superconducting quantum interferometer (rf SQUID), has made important progress, and its performance indicators can meet required by many applications. The application research of HTc SQUID has gradually become the focus of HTcSQUID research. Among them, the research on HTc SQUID device technology has always been paid attention to by people. The main reason is that people still hope to further improve the magnetic field sensitivity of HTc SQUID. The process of superconducting junction is difficult to control, especially the yield rate of HTc SQU...

Claims

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Application Information

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IPC IPC(8): G01R33/035
Inventor 戴远东孟树超刘新元谢飞翔李壮志马平杨涛聂瑞娟王福仁
Owner PEKING UNIV
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