ISSN:
1572-9605
Keywords:
Optical spectrum
;
c-axis conductivity
;
anisotropic factors
;
gap anisotropy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Comparing the optical spectra withE∥c for typical high-T c superconducting cuprates, we discuss the charge dynamics along thec-axis. The plasma energy or the mass anisotropic factorm * c //m * b is one of the key parameters determining the spectrum forE∥c. In Bi2Sr2CaCu2O8 and La2−x Sr x CuO4 with a largem * c /m * b , the plasma energy is smaller than the superconducting gap energy, and thus the supercurrent along thec-axis is a kind of Josephson current flowing through insulating layers such as the BiO layers. On the other hand, in YBa2Cu3O7 with a smallm * c /m * a , it seems that the coherent supercurrent flows along thec-axis. Although the spectrum forE∥c strongly depends on samples, presumably due to the difference in the hole concentration, a clear anisotropy between theab- and thec-directions is observed in the characteristics energy scales such as the plasma energy as well as the reflectivity knee energy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00724592
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