• 커뮤니티
  • 세미나/콜로퀴움
세미나/콜로퀴움
보증 토토
보증 토토
보증 토토

Investigations of the Effects of 보증 토토

본문

The first order vortex melting transition is very sensitive to the presence of disorder and can be supplanted by a second order phase transition in the presence of a sufficiently high density of 보증 토토. We present the results of systematic studies on the effects of 보증 토토 on the first order vortex melting transition in YBa2Cu3O7-?ingle crystals, with a special focus on the upper and lower critical points. The experiments were performed with electrical transport and ac specific heat measurements.The geometry and strength of the 보증 토토 varied, including naturally occurring twin boundaries as well as detwinned single crystals irradiated with successive doses of electrons, protons, or heavy ions. Twin boundaries yield planar 보증 토토, electron irradiation yielded weak point 보증 토토, proton irradiation yielded strong point-like 보증 토토 and heavy ion irradiation yielded strong columnar 보증 토토. Our results indicate that the origins of the upper and lower critical points of the first order melting transition arise from different mechanisms. The position of the lower critical point is determined by the pinning strength of the defect, whereas the upper critical point shifts in response to the geometrical correlation of the 보증 토토.
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