Abstract
Contributions to the irreversibility from the bulk and the surface are investigated in detail for an underdoped Bi-2212 single crystal using the Campbell method. The measured flux profile showed a linear flux distribution suggesting a uniform bulk shielding current as the Bean model predicts in the field-temperature region far below the irreversibility line. Getting close to the irreversibility line, the ac penetration depth became larger and would probably exceed the specimen size because the critical current density approached zero. Hence, the obtained profile was different from the exact one. However, no sign of the surface irreversibility was discovered in this specimen.
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