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Title: Thermal management in large Bi2212 mesas used for terahertz sources
Authors: Kurter, Cihan
Gray, Kenneth E.
Zasadzinski, John F.
Özyüzer, Lütfi
Koshelev, A. E.
Li, Q.
Yamamoto, T.
Kadowaki, K.
Kwok, W. K.
Tachiki, M.
Welp, U.
Keywords: Crystal structure
Intrinsic josephson junctions
Joule heating
Mesa structure
Terahertz emission
Issue Date: Jun-2009
Publisher: Institute of Electrical and Electronics Engineers Inc.
Source: Kurter, C., Gray, K. E., Zasadzinski, J. F., Özyüzer, L., Koshelev, A. E., Li, Q., Yamamoto, T., Kadowaki, K., Kwok, W. K., Tachiki, M., and Welp, U. (2009). Thermal management in large Bi2212 mesas used for terahertz sources. IEEE Transactions on Applied Superconductivity, 19(3), 428-431. doi:10.1109/TASC.2009.2019235
Abstract: We present a thermal analysis of a patterned mesa on a Bi 2Sr2CaCu2O8 (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 × 300 × 1.2 μm3) 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 R qp (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.
ISSN: 1051-8223
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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