Vortex-matter phase diagram in YBa₂Cu₃O_y

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In this Subject: <a title="Electricity & Magnetism" href="/content/subcat;jsessionid=dnjnz9fpxld5.alexandra?j_subject=227&j_availability=">Electricity & Magnetism
By this author: <a href="/search;jsessionid=dnjnz9fpxld5.alexandra?option2=author&value2=Nishizaki+T">Nishizaki T. ;&nbsp; <a href="/search;jsessionid=dnjnz9fpxld5.alexandra?option2=author&value2=Kobayashi+N">Kobayashi N.

Authors: Nishizaki T.; Kobayashi N.

Source: Superconductor Science and Technology, Volume 13, Number 1, 2000 , pp. 1-11(11)

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Abstract:

This paper reviews the progressive results of the vortex-matter phase diagram for the high-T_csuperconductor YBa₂Cu₃O_yin magnetic fields up to 30 T. Evidence of the first-order vortex-lattice melting transition and the second-order vortex-glass transition is demonstrated by resistivity and magnetization measurements. The feature of the novel second magnetization peak is summarized and the origin of the new line H*(T), which is defined by the sharp onset of the second peak, is discussed on the basis of the field-driven disordering transition theory. Effects of the weak point disorder on the vortex-matter phase diagram are also studied by the irradiation of 2.5 MeV electrons. It is revealed that three transition lines of the vortex-lattice melting line H_m(T), the vortex-glass transition line H_g(T), and the field-driven disordering transition line H*(T) terminate at the critical point and divide the vortex-matter phase into three different phases: the vortex liquid, the Bragg glass, and the vortex glass. Interesting similarities of the vortex matter phase diagram between YBa₂Cu₃O_yand Bi₂Sr₂CaCu₂O_yare also discussed.