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Flux-Pinning Properties of YBa2Cu3O7

The flux-pinning properties of YBa2Cu3O7 semisingle crystalline films are investigated. The flux-pinning force density Fp versus a reduced field b=H/Hc2* approximately obeys the formula, Fp∝Hc2*nbp(1-b)q (n=2.6 –3.8, p∼0.7, q∼3.0), similarly to the case of the so-called weak-pinning type. Here, Hc2* is the upper critical field in a limit of zero current. The origin of Fp is briefly discussed.