Commensurability oscillations and smectic vortex phase transition in YBa2Cu3Oy single crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have studied the oscillations of the magnetization induced by commensurability between intervortex and CuO plane distances in YBa2Cu3Oy (y = 6.97 +/- 0.02) single crystals using high angular resolution magnetometry. A sharp peak in the temperature dependence of the amplitude of oscillations was found at T-f similar to 60 K. It is followed by other changes in the behavior of the amplitude and irreversible magnetization. We suggest that T-f reflects the vortex freezing transition from smectic to solid phase; the angular phase diagram is constructed. [S0163-1829(99)08517-3].