Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.3: Talk

Thursday, March 25, 2010, 10:00–10:15, H21

Terahertz emission from intrinsic Josephson junction stacks in high-Tc superconductors: effects of fabrication technique — •Y. Simsek¹, L. Özyüzer^1,2, S. Preu³, D. Ploss³, S. Malzer³, Y. Koval¹, H. B. Wang⁴, and P. Müller¹ — ¹Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany — ²Department of Physics, Izmir Institute of Technology, Izmir, Turkey — ³Max Planck Institute for the Science of Light, Erlangen, Germany — ⁴National Institute for Materials Science (NIMS), Tsukuba, Japan

It was found recently that large area Bi₂Sr₂CaCu₂O_8+δ (Bi2212) mesas show terahertz emission due to intrinsic Josephson junctions (IJJ). We have fabricated large and tall Bi2212 mesas by optical and electron beam lithography, and studied effects of fabrication technique on THz emission characteristics. Monitoring the emission was performed with a Si composite bolometer, while the applied current through the IJJ stacks was slowly swept by a function generator. Emission peaks were observed on I-V return branches while the bias current was decreasing. The frequency of emission was determined by a terahertz interferometer. The observed emission frequencies match the frequency calculated by the cavity resonance condition.