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15 Jun 1998

Volume 72, Issue 24, pp. 3097-3228

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Stability of ultrasmooth surface morphology of (110) YBa2Cu3O7−δ homoepitaxial films and Nb/Au/(110) YBa2Cu3O7−δ junctions

Toshiyuki Usagawa, Jianguo Wen, Yoshihiro Ishimaru, Satoshi Koyama, Tadashi Utagawa, and Youichi Enomoto

Appl. Phys. Lett. 72, 3202 (1998); http://dx.doi.org/10.1063/1.121549 (3 pages) | Cited 3 times

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We report on ultrasmooth surface morphology and chemical activeness of (110)-oriented YBa2Cu3O7−δ (YBCO) films grown on (110) YBCO single-crystal substrates by scanning electron microscopy, reflection high-energy electron diffraction, and transmission electron microscopy observations. The stable (110) YBCO interface can be formed by in situ deposited thin Au film against the chemically active elements like Nb. The in situ formed Nb/Au/(110)YBCO junction shows clear two superconducting transitions Tc1 = 91.8 K and Tc2 = 8.20 K associated with YBCO and Nb films and large supercurrent (at least larger than 2.0×102 A/cm2) much more than expected phenomenological arguments of s wave and dx2−y2 wave. © 1998 American Institute of Physics.
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68.35.B- Structure of clean surfaces (and surface reconstruction)
74.72.-h Cuprate superconductors
74.78.-w Superconducting films and low-dimensional structures
74.10.+v Occurrence, potential candidates
68.55.-a Thin film structure and morphology

Low noise operation of integrated YBa2Cu3O7 magnetometers in static magnetic fields

S. Krey, B. David, R. Eckart, and O. Dössel

Appl. Phys. Lett. 72, 3205 (1998); http://dx.doi.org/10.1063/1.121550 (3 pages) | Cited 4 times

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The noise of two integrated YBa2Cu3O7-SrTiO3-YBa2Cu3O7 multilayer magnetometers in static magnetic fields up to 110 μT is investigated: An inductively coupled magnetometer with integrated flux transformer and a multiloop magnetometer. In both samples, only a moderate increase of the low frequency flux noise is found in high fields, due to the high epitaxial quality of the involved multilayer films. So for moderately shielded or unshielded applications in the earth’s magnetic field, high-quality integrated YBa2Cu3O7 magnetometers can be operated with low excess noise. © 1998 American Institute of Physics.
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07.55.Ge Magnetometers for magnetic field measurements
85.25.Dq Superconducting quantum interference devices (SQUIDs)
07.50.Hp Electrical noise and shielding equipment
74.78.Fk Multilayers, superlattices, heterostructures
74.72.-h Cuprate superconductors
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