Thermal Management in Large Bi2212 Mesas used for Terahertz Sources

Details Thermal Management in Large Bi2212 Mesas used for Terahertz Sources Thermal Management in Large Bi2212 Mesas used for Terahertz Sources

2009-01-27

arxiv.org/abs/0901.4297v1

Physics

Condensed Matter

Superconductivity

4 pages, 2008 Applied Superconductivity Conference

Scientific paper

We present a thermal analysis of a patterned mesa on a Bi2Sr2CaCu2O8 (Bi2212) single crystal that is based on tunneling characteristics of the c-axis stack of ~800 intrinsic Josephson junctions in the mesa. Despite the large mesa volume (e.g., 40x300x1.2 micron3) and power dissipation that result in selfheating and backbending of the current-voltage curve (I-V), there are accessible bias conditions for which significant polarized THz-wave emission can be observed. We estimate the mesa temperature by equating the quasiparticle resistance, Rqp(T), to the ratio V/I over the entire I-V including the backbending region. These temperatures are used to predict the unpolarized black-body radiation reaching our bolometer and there is substantial agreement over the entire I-V. As such, backbending results from the particular Rqp(T) for Bi2212, as first discussed by Fenton, rather than a significant suppression of the energy gap. This model also correctly predicts the observed disappearance of backbending above ~60 K.

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