Commensurability oscillations and a new phase transition in YBa2Cu3Oy single crystalsстатья
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Аннотация:Magnetization oscillations due to the commensurability of the vortex and crystal lattice periods in YBa2Cu3Oy (y=6.97+/-0.02) single crystals are investigated using a high angular resolution magnetometer. A sharp peak in the temperature dependence of the oscillation amplitude as well as other features in the behavior of the oscillation amplitude and of the irreversible magnetization are observed at T(f)similar to 60 K. It is inferred that T-f is the temperature of a transition of the solid vortex state to a smectic phase. (C) 1999 American Institute of Physics. [S0021-3640(99)01211-6].