Zhukov AA, de Groot PA, Kokkaliaris S, di Nicolo E, Jansen AG, Mossang E, Martinez G, Wyder P, Wolf T, Küpfer H, Asaoka H, Gagnon R, Taillefer L. History effects and phase diagram near the lower critical point in YBa2Cu3O7 single crystals.
Phys Rev Lett 2001;
87:017006. [PMID:
11461490 DOI:
10.1103/physrevlett.87.017006]
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Abstract
Using a sensitive torque magnetometer we have studied magnetization curves for untwinned overdoped YBa2Cu3O7 single crystals in fields of up to 28 T. We demonstrate the existence of history effects below the lower critical point and provide a full demarcation of the Bragg-glass phase. A pronounced symmetry is observed in the behavior of the phase lines, irreversible magnetization, and value of the magnetization jump near both critical points.
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