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Proceedings Paper

Zero-crossing steps in intrinsic surface junctions of Bi2Sr2CaCu2O8+δ single crystals
Author(s): Hu-Jong Lee; Yong-Joo Doh; Jin-Hee Kim; HyunSik Chang; Sung-Ho Chang; Kyu-Tae Kim; Woo Lee; Jin-Ho Choy
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Paper Abstract

Irradiating a microwave of several tens GHz on Bi2Sr2CaCu2O8+(delta ) (Bi-2212) single crystals, we observed genuine zero-crossing current steps from intrinsic Josephson junctions forming on the surface of the crystals in contact with normal- metallic (AU) electrodes. The critical current of the surface intrinsic Josephson junction was significantly suppressed due to the proximity contact to the normal-metal electrode, which allowed us to isolate the microwave response of the 'surface junction' from that of rest of the 'inner junctions' in a stack. This indicates that sufficiently small tunneling critical current density is essential to observing the zero-crossing current steps. An attempt to reduce the interlayer coupling using HgI2-intercalated Bi2Sr2CaCu2O8+(delta ) single crystals, however, gave rise to coherent fluxon motions.

Paper Details

Date Published: 6 September 2000
PDF: 9 pages
Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); doi: 10.1117/12.397838
Show Author Affiliations
Hu-Jong Lee, Pohang Univ. of Science and Technology (South Korea)
Yong-Joo Doh, Pohang Univ. of Science and Technology (South Korea)
Jin-Hee Kim, Korea Research Institute of Standards and Science (South Korea)
HyunSik Chang, Pohang Univ. of Science and Technology (South Korea)
Sung-Ho Chang, Pohang Univ. of Science and Technology (South Korea)
Kyu-Tae Kim, Korea Research Institute of Standards and Science (South Korea)
Woo Lee, Seoul National Univ. (United States)
Jin-Ho Choy, Seoul National Univ. (South Korea)


Published in SPIE Proceedings Vol. 4058:
Superconducting and Related Oxides: Physics and Nanoengineering IV
Davor Pavuna; Ivan Bozovic, Editor(s)

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