Surface impedance anisotropy ofYBa2Cu3O6.95single crystals: Electrodynamic basis of the measurements

An electrodynamic technique is developed for determining the components of surface impedance and complex conductivity tensors of HTSC single crystals on the basis of measured quantities of a quality factor and a resonatorfrequency shift. A simple formula is obtained for a geometrical factor of a crystal in the form of a plate with dimensions b?a>c in a microwave magnetic field H ω ⊥ab. To obtain the c-axis complex conductivity from measurements at H ω ∥ab, we propose a procedure that takes into account of sample size effects. With the aid of the technique involved temperature dependences of all impedance and conductivity tensors components of YBa a Cu 3 O 6 . 9 5 single crystal, grown in BaZrO 3 crucible, are determined at a frequency of f = 9.4 GHz in its normal and superconducting states. All of them proved to be linear at T

Keywords:

• Nuclear magnetic resonance
• Anisotropy
• Condensed matter physics
• Single crystal
• Penetration depth
• Conductivity
• Magnetic field
• Superconductivity
• Electrical impedance
• Physics
• Crystal

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