2009/01/27 by C. Kurter, K.E. Gray, K. E. Gray +13
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconducting and THz Device Technology #Topological Materials and Phenomena #cond-mat.supr-con
paper · pdf · doi:10.1109/tasc.2009.2019235
4 pages, 2008 Applied Superconductivity Conference
arxiv created 2009/01/27 · openalex publication_date 2009/06/01 · arxiv updated 2015/05/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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., 40 times 300 times 1.2 mum3) and power dissipation that result in self-heating 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.