Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 10.2: Vortrag

Montag, 23. März 2009, 14:15–14:30, HSZ 105

Fabrication of large Bi₂Sr₂CaCu₂O_8+δ mesas for THz emission — •Yilmaz Simsek¹, Lütfi Özyüzer^1,2, Yuri Koval¹, Paul Müller¹, and Huabing Wang³ — ¹Department of Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Strasse. 1, D-91058, Erlangen, Germany — ²Department of Physics, Izmir Institute of Technology, Izmir, Turkey — ³National Institute of Material Science, Japan

Recently, the observation of THz radiation from Bi₂Sr₂CaCu₂O_8+δ (Bi-2212) single crystals stimulated the research on intrinsic Josephson junctions (IJJ)[1]. We have fabricated large area mesas including many IJJ stacks on Bi-2212 single crystals by electron beam lithography and Ar ion beam etching techniques. As the observed THz emission is probably due to cavity resonances, the fabrication technique was optimized to obtain clear rectangular shapes. We have fabricated large and tall mesas by selective Ar ion beam etching of a Ti layer on Bi-2212. The samples were characterized by dc I-V measurements. We discuss possible resonant features of the I-V characteristics.

[1] L. Ozyuzer, A. E. Koshelev, C. Kurter, N. Gopalsami, Q. Li, M. Tachiki, K. Kadowaki, T. Yamamoto, H. Minami, H. Yamaguchi, T. Tachiki, K. E. Gray, W.-K. Kwok, U. Welp, Science 318, 1291 (2007).

*L.O. acknowledges support from Alexander von Humboldt Foundation.