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The irreversibility line (IL) of magnetically grain-aligned samples of HgBa 2 CaCu 2 O 6+δ was determined from magnetization measurements with the magnetic field, H, parallel to the c-axis. For H<1 T, the IL is well fitted by a model of three-dimensional flux line lattice melting due to thermal fluctuations. For H>1 T, the IL behaves quite differently, being properly...
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