Far infrared reflectivity of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals with different oxygen contents
Book
·
OSTI ID:538193
- Univ. Regensburg (Germany). Inst. fuer Angewandte Physik
- New Zealand Inst. for Industrial Research, Lower Hutt (New Zealand); and others
Results are reported of an infrared reflectivity study of two high {Tc} superconducting Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals. One of the samples was optimally-doped ({Tc} = 91 K) and the other over-doped ({Tc} = 73 K). It is observed that the reflectivity of the optimally-doped crystal is near unity at low temperature (10 K) and at frequencies below 400 cm{sup {minus}1}. The reflectivity of the over-doped crystal is significantly less than unity. The dynamical conductivity and the penetration depth of the optimally-doped crystal are similar to values for optimally-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystal. However, the over-doped crystal displays significantly larger low frequency absorption. The results can be understood within a d-wave picture in which pair breaking increases with increasing hole doping and contributes to a significant quasiparticle density below {Tc}.
- OSTI ID:
- 538193
- Report Number(s):
- CONF-960163--; ISBN 0-8194-2070-0
- Country of Publication:
- United States
- Language:
- English
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