Abstract
We have measured the electrical resistivity of Bi2.2Sr2Ca0.8Cu2O8+δ in the vicinity of Tc for various angles between the [CuO2] double layers of the crystal and the magnetic field. Defining Tc at the transition midpoints, we have measured values for -dHc2/dT=45 T/K and -dHc2/dT=0.75 T/K for the magnetic field parallel and perpendicular to the [CuO2] planes, respectively. This results in an anisotropy of a factor 60. The numerical results are sensitive to the definition of Tc and larger values for the anisotropy cannot be excluded. The results are compared with the anisotropic three-dimensional Ginzburg-Landau theory.
Original language | English |
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Pages (from-to) | 5102-5105 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 38 |
Issue number | 7 |
DOIs | |
State | Published - 1988 |