Abstract
The applicability of electron spin resonance line broadening of a diphenylpicrylhydrazyl paramagnetic probe for measuring the magnetic field penetration depth into the surface of a YBa 2Cu 3O 7−δ single crystal superconductor is studied. The temperature dependence follows a [1−( T/ T c) 4] relation where T c is the superconducting transition temperature, and the average magnetic field penetration depth in YBa 2Cu 3O 7−δ single crystals is determined to be 6250 Å.
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