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Low-temperature AC conductivity of Bi2Sr2CaCu2O8+δ |
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| Authors: | J Corson J Orenstein J N Eckstein I Bozovic |
| Institution: | a Department of Physics, University of California, Berkeley/Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA b Department of Physics, University of Illinois, Urbana, IL 61801, USA c Oxxel GmbH, Fahrenheit Str. 9, Technologiepark Universitaet, D-28359 Bremen, Germany |
| Abstract: | We report measurements of anamolously large dissipative conductivities, σ1, in Bi2Sr2CaCu2O8+δ at low temperatures. We have measured the complex conductivity of Bi2Sr2CaCu2O8+δ thin films at 100–600 GHz as a function of doping from the underdoped to the overdoped state. At low temperatures there exists a residual σ1 which scales with the T=0 superfluid density as the doping is varied. This residual σ1 is larger than the possible contribution to σ1 from a thermal population of quasiparticles (QP) at the d-wave gap nodes. |
| Keywords: | Bi-2212 Terahertz radiation |
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