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20 Apr 1998

Volume 72, Issue 16, pp. 1939-2058

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A design of planar multi-turn flux transformers for radio frequency SQUID magnetometers

Y. Zhang, H. R. Yi, J. Schubert, W. Zander, M. Banzet, and A. I. Braginski

Appl. Phys. Lett. 72, 2029 (1998); http://dx.doi.org/10.1063/1.121254 (3 pages) | Cited 5 times

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We propose a design for planar multi-turn flux transformer for radio frequency (rf) superconducting quantum interference device (SQUID) magnetometers. This transformer is integrated with a coplanar resonator, e.g., on a 1 cm2 LaAlO3 substrate. Its pickup loop is connected with two input coils, separate for dc (low-frequency) and rf currents. A double-hole washer SQUID is coupled to these coils in a flip-chip configuration to form a magnetometer. The separation of rf and dc current paths in the transformer made it possible to demonstrate the rf SQUID magnetometer operation. © 1998 American Institute of Physics.
Show PACS
85.25.Dq Superconducting quantum interference devices (SQUIDs)
07.55.Ge Magnetometers for magnetic field measurements

Planar thin film YBa2Cu3O7−δ Josephson junctions via nanolithography and ion damage

A. S. Katz, A. G. Sun, S. I. Woods, and R. C. Dynes

Appl. Phys. Lett. 72, 2032 (1998); http://dx.doi.org/10.1063/1.121255 (3 pages) | Cited 24 times

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We have developed a process to fabricate planar high-Tc Josephson junctions using nanolithography and a 200 keV ion implanter. Conduction occurs in the ab plane and is interface free. We can systematically tune devices to operate at temperatures between 1 K and the Tc of the undamaged superconducting material by varying the length of the weak link and by changing the amount of ion damage. All of the devices showed clear dc and ac Josephson effects. Measurement of R(T) and Ic(T) of the weak links revealed trends which were consistent with a proximity effect. © 1998 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
85.25.Cp Josephson devices
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
61.80.Jh Ion radiation effects

Highly stable surfaces of Nd1Ba2Cu3Oy single crystals

Wu Ting, N. Koshizuka, and S. Tanaka

Appl. Phys. Lett. 72, 2035 (1998); http://dx.doi.org/10.1063/1.121256 (3 pages) | Cited 7 times

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Single crystals of Nd1Ba2Cu3Oy (Nd123) high-temperature superconductors have been studied using an ultrahigh vacuum scanning tunneling microscope/spectroscopy system at room temperature. A square lattice with average lattice spacings of 4×4 Å2 has been observed on the surfaces of the single crystals without any surface protections or treatments. The as-prepared surfaces are found to be terminated by the CuO chain layer. Several surface defect structures presumably caused by the oxygen depletion are revealed. Among them, an one dimensional structural modulation with period of 1.5 nm along b axis is seen, which is suggested to be created by the ordering of the oxygen vacancies. The surfaces of Nd123 single crystals are proved to be highly clean and stable in air. Our results indicate that Nd123 single crystals are good materials for surface sensitive scientific researches and device applications. © 1998 American Institute of Physics.
Show PACS
74.72.-h Cuprate superconductors
68.35.B- Structure of clean surfaces (and surface reconstruction)
61.72.J- Point defects and defect clusters
61.66.Bi Elemental solids
61.66.Dk Alloys
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
68.37.Ps Atomic force microscopy (AFM)
68.37.Rt Magnetic force microscopy (MFM)
68.37.Uv Near-field scanning microscopy and spectroscopy
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