Focused ion beam high T c superconductor dc SQUIDs

Applied Physics Letters - Tập 59 Số 2 - Trang 234-236 - 1991
Maurizio Zani1, J.A. Luine1, R. W. Simon1, R.A. Davidheiser1
1TRW Space and Technology Group, Redondo Beach, California 90278

Tóm tắt

Light-ion irradiation can controllably reduce the critical current density of high-temperature superconductor thin films. Reported here is the behavior of ErBa2Cu3O7 films patterned into microbridge dc superconducting quantum interference device (SQUID) structures and irradiated with a rastered high-energy focused ion beam of 70 nm diameter. The resultant SQUIDs have demonstrated up to 51% critical current modulation at 46 K. Microbridges with appropriate critical currents manifest Josephson-like behavior in the form of well-defined Shapiro steps appearing with microwave radiation. The IcRn products of these microbridges are typically a few millivolts and the temperature dependence of their normal-state resistance is consistent with conduction through metallic filaments.

Từ khóa


Tài liệu tham khảo

1975, Appl. Phys. Lett., 26, 204, 10.1063/1.88116

1989, Appl. Phys. Lett., 55, 1915, 10.1063/1.102331

1988, Appl. Phys. Lett., 53, 1010, 10.1063/1.100652

1987, Appl. Phys. Lett., 51, 200, 10.1063/1.98922

1987, Appl. Phys. Lett., 51, 139, 10.1063/1.98594

1989, Appl. Phys. Lett., 55, 495, 10.1063/1.102429

1987, Appl. Phys. Lett., 51, 1462, 10.1063/1.98658

1988, J. Vac. Sci. Technol. B, 6, 900, 10.1116/1.584319

1981, IEEE Vol. Mag, 17, 400, 10.1109/TMAG.1981.1060902

1974, Sov. Phys. Tech. Phys., 20, 950

1990, Appl. Phys. Lett., 56, 686, 10.1063/1.102706

Thông tin
Thông tin xuất bản

Applied Physics Letters

Tập 59 Số 2

234-236

Thông tin tác giả